LCONTR*-BETA-TAC : TACTICLCONTR*-BETA-TAC is a tactic.
As defined for use NAT-DED: is a primitive tactic.
Applies LCONTR*-BETA, if that will change the support line.
As defined for use ETREE-NAT: is a primitive tactic.
If a support line is a rewrite node justified by beta, applies
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