Self-test 2 solutions
Finding alternatives in the search tree
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The first node that will be undone is sent, because this is the
last one to be completed. A suitable analogy is a set of Russian dolls.
This a number of dolls, ranging from large to small, all of them being
hollow except for the smallest. All except the smallest are in two parts
and can contain any smaller doll within them. To stack the dolls, you have
to put the bottom of the largest doll on the table, then put the next largest
bottom into it, and so on until the smallest doll goes in. Then you can
start putting the tops on, until you place the top of the largest doll
on and complete the set.
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13 nodes.
