256.--THE DIAMOND PUZZLE.

IN how many different ways may the word DIAMOND be read in the

arrangement shown? You may start wherever you like at a D and go up or

down, backwards or forwards, in and out, in any direction you like, so

long as you always pass from one letter to another that adjoins it. How

many ways are there?

[Illustration]

Amusements in Mathematics · 第 289 / 970 题