make some unary functions no longer invisible
Major Section:  EVENTS

(remove-invisible-fns (binary-+ unary-- foo)
The setting above has makes unary functions unary-- and foo no longer ``invisible'' for the purposes of applying permutative :rewrite rules to binary-+ trees.

General Form:
(remove-invisible-fns top-fn unary-fn1 ... unary-fnk)
where top-fn is a function symbol and the unary-fni are unary function symbols.

See add-invisible-fns and also see invisible-fns-table and see set-invisible-fns-table.