TR-POBTREE is a wff operation.
Print out the given obligation tree as a tree. If no obligation is given,
the tree below the current obligation is printed out.

Numbers in round brackets are open obligations; those in square brackets are
Branches with *'s denote nodes that are being omitted for lack of space.
The cure for this is to either start printing from a node lower in the tree,
or make the screen wider.
The calling scheme for TR-POBTREE is:


The result is of type MATINGSTREE.

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