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Which combinations of pre-, post- and in-order sequentialisation are unique?

I have three different tree traversal of a binary tree Inorder, Preorder and Postorder. I want to identify the tree back from these traversal. I found that a single traversal cant not identify the tree.
So if I'll take in pair then can I identiy the tree?

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    $\begingroup$ You can find an answer here. $\endgroup$ – A.Schulz Oct 13 '12 at 6:09