PR93 : INFO

PR93 is a flag setting or other piece of information.
A flag setting for PRIMSUB-METHOD.
For all integers from MIN-PRIM-DEPTH to MAX-PRIM-DEPTH:
At depth 1, a single quantifier is introduced, as in PR89.
At depth N>1, we have (N-1) quantifiers ranging over a formula
containing (N-1) conjunctions {disjunctions} of (N-2)
disjunctions {conjunctions}.

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