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Proof step 3 from proof inv-get (previous step)

# xs < h, ys = [] ∨ # ys = h ⊦ ⟪caterpillar_get#(h, xs, ys; ; x)⟫ true

Heuristic unfold applied rule call right

And obtained the following new goals

Proof step 4:
# xs < h, ys = [] ∨ # ys = h ⊦ ⟪x := prefixn(h, xs + ys)⟫ true

Rule argument

pos: right 1

Additional information

Used simplifier rules: get: ⊦ ;