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Proof step 6 from proof valid-group-nodes-drop-superfluous-prefixn (previous step)

gnd = mkgnode(nd, m, boolvar, boolvar0), (boolvar0 ⊃ # gndx + 1;valid-group-nodes(gndx)) ≤ n, ∀ n. valid-group-nodes(gndx) ≤ n → valid-group-nodes(prefixn(n, gndx)) = valid-group-nodes(gndx) ⊦ valid-group-nodes(prefixn(n, gndx + gnd ')) = (boolvar0 ⊃ # gndx + 1;valid-group-nodes(gndx))

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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