I have always had trouble remembering what exactly are the orders of inorder, preorder and postorder traversals. Well today I think iv had the defining insight :). the "IN","PRE" and "POST" is based on where the root node is.
- In "INorder" the root node is "IN" the middle of left and right nodes
- In "PREorder" the root node is "PRE" i.e. before the left and right nodes
- In "POSTorder" the root node is "POST" i.e. after the left and right nodes
This was that proverbial duhh moment :)