RosettaCodeData/Task/Tree-traversal/UNIX-Shell/tree-traversal-2.sh

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preorder: 1 2 4 7 5 3 6 8 9
inorder: 7 4 2 5 1 8 6 9 3
postorder: 7 4 5 2 8 9 6 3 1
level-order: 1 2 3 4 5 6 7 8 9