30
NLR (preorder): 20 10 5 2 14 12 17 30 24 29 32 31
LNR (inorder): 2 5 10 12 14 17 20 24 29 30 31 32
LRN (postorder): 2 5 12 17 14 10 29 24 31 32 30 20
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30
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