MS91-TIME-BY-VPATHS is a flag or parameter.
When T, the amount of time given by SEARCH-TIME-LIMIT and
MAX-SEARCH-LIMIT will be multiplied by the number of vertical paths
through the vpform and then divided by the number of paths through
the initial vpform (so the first vpform will get SEARCH-TIME-LIMIT
seconds, and if the next has twice as many paths it will get twice
as many seconds, and so on...).
When NIL, every option set will get the same search time.
This flag only applies in MS91 procedures.
MS91-TIME-BY-VPATHS takes values of type BOOLEAN.
It belongs to subjects MS91-7 MS91-6 .
Its default value is NIL
Its current value is NIL.

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