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Proof step 7 from proof refine-get (previous step)

prefixn(h, xs1 + ys) = prefixn(h, xs0), xs = xs1, # xs1 < h, # xs1 + # ys ≤ # xs0, ys = [] ∨ # ys = h ⊦ ⟨x := prefixn(h, xs + ys)⟩ (prefixn(h, xs0) = x)

Proof step 7 from proof refine-get (previous step)

Heuristic symbolic execution applied rule assign right

And closed the goal!

Rule argument

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