WEIGHT-C-FN is a flag or parameter.
A function that should take an list of options as argument and
return a value to be used as its weight-c. Currently, the only such
predefined functions are OPTION-SET-NUM-VPATHS, which returns the number of
vertical paths through the relevant etree, and OPTION-SET-NUM-LEAVES, which
returns the number of leaves in the relevant etree.
The total weight of a set of options is the weight-a of each option
plus the weight-b of the set plus the weight-c of the set.
WEIGHT-C-FN takes values of type SYMBOL.
It belongs to subjects MS91-7 MS91-6 .
Its default value is OPTION-SET-NUM-LEAVES
Its current value is OPTION-SET-NUM-LEAVES.

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