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Proof step 6 from proof ex-notin (previous step)

ns.max + 1 ∈ ns ⊦ # ns = 0, ns = ∅, ns.max < ns.max + 1

User applied rule weakening

And obtained the following new goals

Proof step 7:
⊦ # ns = 0, ns = ∅, ns.max < ns.max + 1

Rule argument

poslist: left 1

Additional information