LEXPD*-BETA-TAC is a tactic.
As defined for use NAT-DED: is a primitive tactic.
Applies LEXPD*-BETA, if that will change the planned line.
As defined for use ETREE-NAT: is a primitive tactic.
If the planned line corresponds to a rewrite node with justification
beta, applies lexpd*-beta rule.

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