CHAPTER I

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The Wonder Island Boys

THE MYSTERIES OF THE CAVERNS

by

ROGER T. FINLAY

Illustrated

The New York Book Company

New York

Copyright 1914

[Illustration: _"The professor was reading the scrap, and silently

handed it to George"_]

CONTENTS

I. MYSTERIOUS DISAPPEARANCE OF THE TEAM

The runaway team. Circumstances leading up to the present

condition. The singular occurrences. Examining the tree. The search

for the yaks. Red Angel as a scout. On the tracks. Losing the

trail. Red Angel's discovery. The wrecked wagon. The lost weapons

and ammunition. Breaking in new steers. The planting program.

Different plants and soils. Prospecting for ores and vegetation.

Discussing hunting trip. How people of different countries select

soils. Wild fruit and vegetables. Lessons from the actions of their

animals. Propagation of fruit and vegetables. Chemical changes

produced by different soils. The wild potato.

II. WORKING ON THE NEW BOAT

Determine to bring in the newly discovered lifeboat. Trip to South

River. Finding the broken yoke of their team. Recovering the

lifeboat. Uses for the bolo. Decision to row the boat around the

point. Making more guns. Preparing new tools. Alloys and their

uses. Hardness of metal. Bronze. Ancient guns. Manganese. Making

stocks for the guns. Commencing the hull of the new boat. Size of

the vessel. About shape or form of hulls. Momentum. Resistance. Red

Angel's attempt to whistle. Amusing performance. Teaching Red Angel

accomplishments. Vibration, the universal force.

III. THE HIDEEN MESSAGE

The new yoke for the yaks. Some of the mysteries. Discussion

concerning future discoveries. Rainbows. Musical pitch and colors.

Reflection and refraction. Riding the yaks. Completing some of the

guns. The trip after the wrecked wagon. Finding their runaway team.

Accounting for their disappearance. Prospecting. Sugar cane

discovered. Sorghum. The Tamarisk. Rigging up the lifeboat with

sails. Discovery of a hidden message in the lifeboat. Examining the

place where it was found. Determining the time when the message was

written. Rushing preparation of guns and ammunition. Galena. Lead.

Getting rid of the sulphur. Making bullets.

IV. THE TERRIBLE MONSOONS

Completing the guns. Description of the new ones. Polishing grit.

Emery. Corundum. Laying the keel of the big boat. Terrible winds.

The monsoons. Trade winds. Length of summers north and south of the

Equator. Disappearance of the flag from Observation Hill. George

and Angel's hunt for the flag. Disappointment. Angel finding the

flag. Angel's laugh. Facial expression in animals. Brass. The form

of bullets. Why pointed at one end and hollow in the other. Rifling

guns. Spiral movement. Molds for castings. The Professor's desire

to fully explore the cave. Weaving the sails for the new boat.

Angel's work on the loom.

V. THE VOYAGE FOR THE BENEFIT OF ANGEL, AND THE DISCOVERY

Completing the hull of the new boat. Making manilla rope. Decide to

take Angel along. Enticing him aboard. His consternation. Rounding

the cliffs. Discovering their first boat among debris. Taking it

along as a trailer. Sailing up Cataract River. Evidence that their

boat had been used by some one. Proof of its use by the natives.

One of the signs of civilization. Leverage. Fulcrum. Mechanical

powers. Delay of voyage owing to weather. Tourmaline. Harry's

invention. The bamboo tubes. Testing how fast the guns could be

loaded and fired. Cartridges. The marine works. The boats. Three

cheers for the new ship.

VI. THE GRUESOME FINDS IN THE CAVE

The cave. Taking the boat to explore the interior. The air pocket.

A board for charting the cave. The boat on the wagon. Entering the

cave. The lights. Returning for the boat. The peculiar noise at the

cave entrance. Methods for searching the cave. The domed chamber.

Making a circuit within it. The outlet. The second chamber. The

chalk icicles. Limestone. Volcanic action. Carbonic acid, and what

it produced. The caves of the world. What is learned in searching

caves. Their archaeological knowledge. A peculiar formation in the

large chamber. A platform within a recess. Skulls and skeletons.

Ancient weapons. Evidences of a terrible conflict. Musket balls.

Dirks and unknown forms of weapons. Singular copper receptacles.

Curiously wrought knives. Articles of furniture. Decayed clothing.

Kitchen utensils. Why the cave takes care of the smoke.

VII. THE TREASURES OF THE CAVE

The couch in the recess. Chests of gold. A pirates' lair. The

ancient coins. Peculiar articles of ornament. The lid with mocking

lock. Rings; bracelets. The buccaneers. The sermon. Ghastly relics.

A perceptible movement in the atmosphere. Startling supposition. A

possible outlet in the side of the hill. The slab of carbonate. The

writing on it. An accident and the finding of other skeletons. The

light shining into the cave. Discovery of the outlet. View of the

cataract from the opening in the hillside. The boat in the cave.

Taking it out by the hillside opening. The Professor's search.

Return of the boys with the team. Re-enter the cave. The Professor

lost. Hunting in the unknown passages. Return of the Professor.

Taking two of the skeletons to the laboratory.

VIII. REMOVING THE VESSELS FROM THE CAVERNS

Completion of the boat. Making a trial voyage. Rounding the cliffs.

Trip to the south. The forests and the mountains. On the south

coast. A raging storm. Seasickness and dizziness at great heights.

The calcareous slab from the cave. The letters on it. Photography.

Reagents. Photographic light. X-rays. Taking the copper vessels

from the cave. Gathering up the bones. Evidences of the strife.

Spanish inscriptions. Gold bullion. Silver ornaments and vessels.

Decayed chests. The coins. Peculiar guns. Non-effective powder.

Disappearance of Angel. Return of Angel with a rusted modern gun.

Iron or steel guns. Powder as a factor in making weapons.

IX. MAKING ELECTRICITY

Their present condition. What they had accomplished. Working for

love. Contemplating the hoard in the cave. Selfishness at the

bottom of the pirates' lives. Gathering sugar cane. Honey, and its

uses in ancient times. Beets and various tubers. Fattening

properties. Nitrogenous matter. The load of cane. Making a sugar

mill. Lime in sugar-cane juice. Clarifying sugar. A candy pulling.

Granulating sugar. The earth as a magnet. Electricity. Positive and

negative. Magnetic poles. Likes and unlikes. Making a magnet.

Retaining magnetism in a bar.

X. STARTING ON THE VOYAGE TO THE WEST

A barometer. Air pressure. A compass. The atmosphere. Dry weather.

Observing weather conditions. Providing compartments in the boat

for provisions. Bedding. Water supply. Faith. Preparing a tablet

for the Cataract. A terrific storm. A delayed departure. How delays

have often proved valuable to investigators. Starting the voyage to

the west. Striking a course. Observations on speed. Going with the

wind. Tacking. Angles of incidence. The action of air on a surface.

Determining the pressure of air by its velocity. Flying machines.

Time and speed in a vessel. Qualities necessary in a sailor.

XI. A TERRIBLE VOYAGE AND THE SHIPWRECK

The shadows of night. Recalling memories of their shipwreck. The

charting board. Cardinal points of the compass. How direction

traveled is laid out on the chart. Measurement by angles. A weary

night. The watches. The wind changing. The second day. Cliffs

beyond. Sailing against the wind. Rounding the northern point. The

fourth day. The increasing gale. Night. The lights to the south.

The gale turning to a storm. Driven back. A night without sleep. An

appalling monsoon. Springing a leak. The Professor exhausted.

Danger ahead. The cliffs. A maelstrom in sight. Averting the

danger. Recovery of the Professor. Steering for shore. Striking the

beach. The vessel shattered. Stranded miles from home. Taking up

the march. Putting an inscription on the boat. Nearing home.

XII. THE RETURN TRIP. THE ORANG-OUTANS

The blackened fire space. Discovery of their own camp in the

forest. An adventure in the woods. A huge bear. George's shot.

Charging the Professor, and his shot. Attacking George. Safety

behind a fallen tree. Search for the luggage. The cries of Angel.

The bear finding their packages. The bear making use of their

things. What they had left. The yellow pear. Guava. The coffee

tree. Cherries. Gathering coffee berries. How Angel made himself

understood. His excitement. The discovery of a number of

orang-outans. Red Angel visits them. He is not welcomed. Return of

the animal. The clearing in the woods. Recalling the fight of the

bears over the honey.

XIII. THE STRANGE VISITOR

The flag on Observation Hill. Approaching Cataract. The alarm by

Red Angel. The house intact. Discovery of a man at the stable. His

peculiar actions. Lost memory. Aphasia. Unable to speak.

Recognizing the signal flag on the strange man. Provided with

clothing. A peculiar malady. The instinct of self-preservation.

Going with George to Observation Hill. The actions of a sailor. The

stranger visits the workshop. Expert with the use of tools.

Projecting an exploring trip by land. Naming the stranger John.

Startled at sound of the name. Mechanically performing work.

Examining the skulls.

XIV. AN EXCITING TRIP TO THE FALLS

The food supply. Butter. Cream. Centrifugal motion. Difference in

specific gravity between cream and milk. Making a cream separator.

Vegetables. Onions. Chives. The stranger as a prospector. Procuring

samples. Peculiarities of his malady. An exciting encounter with a

bear. John's skill as a hunter. Another honey tree. Killed with a

spear. The bear pelt. Visiting the falls. Action to indicate that

John recognizes the falls.

XV. THE STORY OF THE CAVE

Mystery about John. Humanity's search. The desire to know and

acquire. Gathering supplies for an extended trip by land. The boys

visit the cave. Determine to search the chamber visited by the

Professor. Gorgeous calcareous hangings. The ghosts of past

centuries. Gold and silver vessels. Skeletons. A recess. A row of

chests. Spanish guns. The chained skeletons in the recess. An

arsenal. The struggle. Locked in the embrace of death. Ancient

origin of the cave. Paleontology. Stone and bronze ages. Atlantis,

the great continent in the Atlantic, which disappeared. Story of

the Egyptian priests. The actinic rays. Purifying action of

sunlight. Bacteria. Glass houses. The eye. How it expresses

character. Laughter. How it brightens the eye. Fishhooks. A fishing

party. The salmon.

XVI. MUSIC AND ANIMALS

Preserving fish. Why heat is used. The use of tin for cans. Music.

The violin made by the boys. Violin strings; what they are made of.

How they are prepared and treated. The concert. How the music

affected Red Angel. John enraptured. How it touched him. The change

in his eyes. The field mouse. How different animals are moved by

music. The lion. Hippopotamus. Tigers. Monkeys. Momentary flashes

of intelligence in John. Building a new wagon. Finding and making

paint. Lead. Fermentation. Flax. Driers. Turpentine. Synthetic

food. Analysis. Tubes for powder. Completing the guns. Stocking the

wagon with provisions. Starting on the trip. Jack and Jill. The

sixth trip.

XVII. THE TRIP THROUGH THE DENSE FOREST

The trip along Cataract River. The great forest. How Angel

traveled. Reaching South River. Discovering a second falls. Where

the debris on a seashore comes from. The jungle. Leaving the river.

The two animals in the night. The camp aroused. A fight in the

dark. The puma. The frightened team. The injured yak. Animal

language. The panther. Trying to avoid the forest. Growing denser.

John and Harry scouting through the forest. Blazing a trail. The

hidden luncheon. End of the forest. Returning to the wagon. The

noise in their path. The wagon following the trail. The injured yak

improving.

XVIII. SEEING THE FIRST SAVAGES

Teaching Angel. Finding a campfire. Determine from the conditions

that it was recently made. Prospecting from the tops of trees. A

climbing ring. How made and used. The climbing operation. Harry

sees another forest to the south. Clear in the west. The wounded

yak calls a halt. Resuming the journey. Harry in the grasp of a

giant anaconda. John severs its body with a bolo. Boa constrictor.

The python. The Cashew tree. Gum arabic. Seeing the West River.

Discovering signs of habitations to the south. Course to be

followed in meeting the natives. Hearing voices in the night.

Crackling of twigs. A party of savages. The next morning. Examining

the tracks made by the midnight party. Following the trail thus

made. The open country. The first view of the inhabitants.

LIST OF ILLUSTRATIONS

"The Professor was reading the scrap, and silently handed it to George"

"'We have probably found a pirate's lair, and here is the booty'"

"The Professor walked toward him and held out his hand"

"With a single stroke the body of the snake was severed above the last

coil"

LIST OF FIGURES

1. The Broken Yoke

2. Top View of Boat

3. Side View of Boat

4. Cross Section of Boat

5. Force of Momentum

6. Red Angel

7. The Color Spectrum

8. Reflection Angle

9. The Hidden Message

10. The First Gun

11. The Bullet

12. The Sea-going Boat

13. The Cave

14. The Slab Found in the Cave

15. Old Coins Found in Cave

16. Cane Crusher

17. A Magnet

18. Magnetic Induction

19. The Two Magnets

20. Making a Permanent Magnet

21. Illustrating Wind Pressure, 1

22. Illustrating Wind Pressure, 2

23. Mariner's Compass

24. Chart of the Voyage

25. The Charting Board

26. Guava

27. Coffee

28. Cream Separator

29. The Lion and Cubs

30. The Puma

31. The Acajou

THE MYSTERIES OF THE CAVERNS

CHAPTER I

MYSTERIOUS DISAPPEARANCE OF THE TEAM

The boys looked at the Professor in amazement. They were too much

excited and concerned at the new situation to be able to interpret what

the sudden disappearance of their team meant.

The Professor turned to the boys: "Are you sure the yaks were tied

before we left them?"

"I was particularly careful," answered Harry, "to tie both of them."

"I am pretty sure that both were securely fastened, and they were in

that condition when I came back the last time," was George's reply.

To understand the peculiar situation above referred to, it will be

necessary to go back and briefly relate some of the remarkable events

which had taken place in the lives of the three people concerned in this

history.

George Mayfield and Harry Crandall, together with a Professor, were

mates on a ship training school, which sailed from New York one year

before. A terrific explosion at sea cast them adrift in mid-Pacific

Ocean, and after five days of suffering they were cast ashore on an

apparently uncharted island, without any food, and entirely devoid of

any tools, implements or weapons.

Exercising the knowledge of the Professor, and the ingenuity of the

boys, they gradually dug from mother earth and from the rocks and trees

the articles necessary to sustain life, and eventually they found

different ores from which various implements and weapons were made. They

constructed numerous machines, crude, at first, and gradually developed

them. They succeeded in capturing yaks, a bovine species of animals,

some of which were trained like oxen; wagons were built; a shop

constructed; a water wheel installed; a primitive sawmill put up; a

primary battery made; articles of clothing woven; felt made; and

numerous things of this character originated from material which nature

had furnished in its crude state.

While doing all this the desire to explore the island was a

predominating one. Four trips into the interior had been made in order

to ascertain whether or not it contained any human beings. During those

trips numerous evidences were found to show that savages were there, and

some indications that civilized people had visited the island.

The peculiar happenings which excited their interest were the mysterious

things that occurred at various times, among which the following may be

briefly enumerated: The disappearance of a boat, which they built, and

which was left at the place where the team was lost; the subsequent

finding of the boat among debris on the seashore, having oars and rope

in it which were strange to them; the removal of the flagpole and flag

which had been erected up on a high point near the ocean, called

Observation Hill, and the fire in the forest.

To the foregoing may be added the discovery of a prospecting hole, which

had been dug, evidently, by some one in the hope of finding mineral; a

yak with a brand on it; wreckage of a boat, which, undoubtedly, belonged

to their ill-fated ship; a gruesome skeleton on the seashore; and

finally one of the lifeboats of the schoolship and a companion to their

own, found on the shore of the stream where they now were.

All these things were sufficient not only to cause alarm, but the

greatest consternation on the part of the boys. It must be said,

however, that the trials of the boys, under the calm, calculating

deportment of the Professor, had done much to make them self-reliant.

George, the elder, was of an exceedingly inquisitive turn of mind; he

was a theorist, and tried to find out the reason for everything. On the

other hand, Harry was practical in all his efforts; he could take the

knowledge obtained and profit by it, as the previous volumes show. It

was fortunate, therefore, as the Professor put it, that theory and

practice were personified in the two boys, who, although companionable,

were the exact opposites as types.

The Professor never showed a preference, in any manner, for either. Like

the true philosopher he saw the value of the two distinct qualities, the

one useless without the other.

When they had fully recovered from their astonishment, George was the

first to speak. "They may have broken the fastenings."

The Professor, who had been intently examining the tree to which they

were hitched, said: "I can find no evidence of any undue wrench which

might show that they had gotten away by their own exertions. Let us see

whether we can follow the trail."

The ground was covered with leaves, so that no earth was visible, and

the only sort of trail left in a forest, under those conditions, is the

slightly depressed tracks which the wheels make. They examined this,

noting also the overturned leaves, which are usually left in the wake of

cattle.

The latter means seemed to be the only available way in which any trace

could be made out, and this they followed. It led directly to the west,

and toward the section they were desirous of exploring at the time the

present trip was inaugurated.

"How fast do you suppose the team is traveling?"

"Certainly not faster than we are now going. They cannot be hurried very

well, as you know, and we should be able to overtake them within an hour

or two."

"But what shall we do if we find them in charge of somebody?"

That suggestion brought up at once a very serious question. They had

made six pistols, very crude, it is true, but which served admirably as

weapons of defense; but the hazardous part of the present situation was

that only the Professor had one of the pistols, the others having been

left with the team. The only thing which added some comfort was the

knowledge that as the pistols required a special hook to enable them to

cock the firing plug, and as the Professor had this hook, those who took

the team might not be able to use the weapons against them.

At this place it might be well to refer to Red Angel. Nearly nine months

before, on one of their trips, a baby orang-outan had been captured, and

the boys educated him, as best they could, and he really developed many

reasonable instincts. It was Red Angel who left the wagon and followed

them down the river, and who by his peculiar actions attracted attention

to their missing team.

"We owe something to Angel for his cuteness in coming for us," said

Harry.

The orang progressed rapidly, swinging, as he did, from tree to tree on

the route, and when no trees were in sight, would shamble along in a

peculiar way, as it is difficult for them to walk erect. Their feet are

not adapted to promote a graceful gait.

"The track seems to be lost," said the Professor. "I cannot make it out,

either from the leaves or the depression. However, it appears best to

follow this course."

Without stopping they proceeded in the same general direction. Red

Angel, who up to this time had followed the route taken by the party,

now turned to the right, and when George called, refused to return. As

George walked toward him, he kept advancing to the right, and could not

be induced to come back.

"Probably we should follow him," was the Professor's conclusion.

It was evident from Angel's antics that the change in the course

delighted him.

George, who was ahead, soon stopped, and shouted back, gleefully. "Here

are the tracks! Good fellow, come here!"

Angel understood this. He had actually sensed the direction taken by the

missing team, for here were the tracks. The only thing that grieved

George was the absence of the honey pot. Angel's weakness was honey, and

that was now with the team.

Suddenly Angel, who was now in one of the large trees which grew all

along the course, began an excitable chatter, and vigorously jumped from

one limb to the next, and George, who knew his antics pretty well by

this time, stopped and prepared himself for some new and unexpected

development in this remarkable journey. Angel, on the other hand,

started off through the trees with wonderful agility, and it was all the

boys could do to follow.

There, ahead of them, was the wagon perched against a tree, one of the

front wheels and an axle broken, and the tongue wrenched off; but the

yaks had disappeared. It is singular that the team had gone thus far

without meeting an obstruction. As it was, one wheel had locked with a

tree, and the yaks, by their tremendous power, had broken the parts

mentioned and gone on.

Before the wagon was reached, however, numbers of articles were found

scattered along the trail, which were gathered up.

The finding of the wagon was an intense relief. Their minds had been

perturbed with this occurrence, as never before, and they had met

numerous thrilling episodes before.

"Something must have frightened the yaks, and they were going at a much

greater speed than at a walk when they collided with the tree," observed

the Professor.

"Why do you think so?" asked Harry.

"In the first place, the fact that our articles were scattered along the

path before they reached the tree; and, secondly, the wagon pole and the

wheel were strong enough to hold the yaks against the tree if they had

been moving along at their usual gait."

"Well, I am thankful that we have the wagon, even though the yaks are

gone," said George, as he crawled into it. He peered out and continued

in a surprised tone: "Where do you suppose the pistols are? Did you

leave yours in the box, Harry?"

"Yes; on the right side. Yours were there at the time. I saw all of

them."

"They are not here now, and it is likely they have been lost with some

of the other things." Harry was up in an instant.

"Where is the ammunition?"

"It was all in the bottom of the box."

It did not seem at all likely that the pistols or the ammunition could

fall out of the box. It is true other things had fallen along the way,

but this seemed to be such an unlikely occurrence that they could

scarcely credit it.

The provisions were safe, and you may be sure that Angel was not only

petted, but he received a good share of the delicious sweet.

It was now nearing night, and they were fully ten miles from home. Ten

miles is not a long tramp, but to travelers like ours, already weary

with their trudging and with the excitements of the day, it was

concluded to camp in the wagon for the night, and then proceed home

early in the morning. To take the wagon would be an impossibility.

They really learned to love the patient yaks. For fully five months they

had been daily companions, and were now so well trained that some

discouragement was felt at being compelled again to break in others.

They had an ample supply of good material in the herd to pick from, but

it took time and patience to develop such a team as had been lost.

During the entire night one of the trio kept watch, not so much from a

feeling of fear as in the hope the yaks would return during the night;

but they were doomed to disappointment. Morning came, but the yaks did

not, and after gathering together the most useful belongings, and

putting them into convenient bundles for carrying purposes, set out for

home.

The first question taken up by the boys after their return was the

selection of a pair of young steers for the new team; and the work of

making a new pair of yokes was carried forward with energy. They were in

the midst of the planting season which had been interrupted when the

last journey was undertaken.

Hitherto it had been the custom to devote at least one day each week to

hunting, on which occasions they also made trips to such points in the

island as had not been previously visited; and it was also a part of

their duty to examine the woods and the fields to find new specimens of

plants, fruits and flowers; and among the hills and ravines were many

kinds of ore, some of which they had been fortunate enough to find on

their entry to the island.

The metals thus found were utilized, because they had set up a workshop

alongside the sawmill, and in it had a crude lathe adapted to work in

wood or iron. It will thus be seen that each tour was for prospecting

purposes, to supply their needs, as well as to learn what the island

contained.

Each evening it was the habit to have a general discussion concerning

the events of the day, or with reference to matters of moment about the

work to be done on the morrow.

George was much interested in the planting program. "What kinds of

vegetable would it be most advisable to plant in the space we have

prepared?"

"One of the important points to consider in the planting of all crops is

whether the soil is adapted for it. When the United States were first

settled it was a surprising thing that many of the original settlers

would go miles inland, exposed to every sort of danger, to find land,

when there was plenty nearer the seashore or close to civilization.

There was a reason for that which we are only now beginning fully to

understand. Plants have a habit of growing in soil adapted for their

needs, and it would be an interesting study in going over our island to

consider the habits of plants in this respect."

"Is that the reason why different countries have such different kinds of

plants?"

"Yes; plants select their soil, and owing to these habits, every variety

of soil, in every climate, supports its own vegetable tribes. Of the

five thousand flowering plants of central Europe, only three hundred

grow on peaty soils, and those are mainly rushes and sedges. In the

native forests of northern Europe and America, the unlettered explorer

hails with joy the broad-leaved trees glittering in the sun among the

pines, as a symptom of good land, which he knows how to cultivate. The

rudest peasant in Europe knows that wheat and beans seek clay soils; the

northern German knows that rye alone and the potato are best adapted for

the blowing sands of that country; the Chinese peasant, that the warm

sloping banks of light land are fitted for the tea plant, and stiff,

wet, impervious flooded clays for his rice. Even the slaves in the

Southern States were aware that open alluvial lands were best suited to

cotton; and the degraded slaves of Pernambuco know that the cocoa grows

only on the sandy soils of the coast, just the same as in west Africa

the oil palms flourish on the moist sea sand that skirts the shore, and

the mangroves where muddy shallows are daily deserted by the retiring

tide."

"Some time ago you stated in one of our talks that soil was the

necessary thing to select in order to propagate, or make good fruit and

grain out of the poor or wild kind. Were all our vegetables and grains

originally wild?"

"Originally nothing in the way of fruit, flower, grain or garden

vegetables was anything but wild and unproductive, or bitter, tasteless

or unprofitable. Chemical changes are made in the plant by the soil in

which it grows, because it is from the soil that it gets its food. The

large and juicy carrot found at home is nothing but the woody spindle of

the wild carrot, and I have found several species of it here. Cabbages,

cauliflowers, Brussels sprouts and a host of other like vegetables were,

in their natural state, poor, woody, bitter stems, and had useless

roots. As I have already stated, the wild potato, which we are now

cultivating, has, in its original state, a bitter root, as you have

discovered."

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