LEIBNIZ=-SLINE-TAC : TACTIC

LEIBNIZ=-SLINE-TAC is a tactic.
As defined for use ETREE-NAT: is a primitive tactic.
If a support line corresponds to rewrite node with justification
for a rewritten equality using the Leibniz definition, justifies the line
appropriately, and makes a new support line with the rewritten wff.

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