NEG-EXISTS-ELIM-SIMPLE-TAC : TACTIC

NEG-EXISTS-ELIM-SIMPLE-TAC is a tactic.
As defined for use ETREE-NAT: is a primitive tactic.
If planned line is FALSEHOOD, and a support line is a negated existentially
quantified formula with exactly one admissible expansion, applies eneg rule.
Same as Pfenning's tactic 220.

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