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Proof step 4 from proof get-last-nonempty (previous step)

# x = m + 1 ⊦ x[m] = x.last, x = []

User applied rule constructor cut

And obtained the following new goals

Proof step 5:
x = a + x0, # x = m + 1 ⊦ x[m] = x.last, x = []

Rule argument

var: x

Additional information

Used simplifier rules: list freely generated by [], +;;