RULEC-TAC : TACTICRULEC-TAC is a tactic.
As defined for use NAT-DED: is a primitive tactic.
If a support line is existentially quantified, will apply RULEC
with a brand new variable.
As defined for use ETREE-NAT: is a primitive tactic.
If a support line corresponds to a selection node, applies
RuleC. Same as Pfenning's tactic 207.
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