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Proof step 23 from proof reachable-nodups-def (previous step)

path(r ' + x, H) ⊦ dups(x), r ∈ x, ∃ x0. path(r ' + x0, H) ∧ (r ' + x0).last = (r ' + x).last

Heuristic quantifier closing applied rule exists right

And closed the goal!

Rule argument

pos: right 3 terms: x

Additional information

Used terms: x