INDIRECT2-TAC : TACTIC

INDIRECT2-TAC is a tactic.
As defined for use NAT-DED: is a primitive tactic.
Applies INDIRECT2 if two support lines are contradictory.
As defined for use ETREE-NAT: is a primitive tactic.
If planned line is FALSEHOOD, two support lines are contradictory,
and are mated, applies indirect2 rule. Same as Pfenning's tactic 212.

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