PTREE : MATEOPPTREE is a mating-search command.
Print out the etree below the current topnode, showing expansion
variables, skolem terms, selection terms, and rewrite justifications.
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, or use SHOWNOTYPES. See also PTREE*
PTREE is a printing command.
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