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Warning: Notation Change

From now on, we use the following function names: 

// return depth of Tree (was TreeDepth)
int depth(Tree t) { ... }

// return #nodes in Tree (was TreeNumNodes)
int size(Tree t) { ... }

// return #nodes in Tree (see later)
int count(Tree t) { ... }

This amounts to changing the Tree ADT interface ... bad for clients.