PROBLEM 3. Alternate left and right ends

Doors No. of No. of

Settings open doors open right door

1..................5.6........................2..................5

2..................5.6........................2..................6

3..................4.5.6.7.8.9................6..................4

4..................4.5.6.7.8.9................6..................9

5..................1.2.3.4.5..................5..................1

6..................1.2.3.4.5..................5..................5

7..................2.3.4.5.6.7................6..................2

8..................2.3.4.5.6.7................6..................7

9..................3.4.5.6.7.8................6..................3

10..................3.4.5.6.7.8................6..................8

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