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Proof step 23 from proof even-sum (previous step)

even(i1) ∧ even(i2) ∨ odd(i1) ∧ odd(i2), even(i) ∧ even(i0) ∨ odd(i) ∧ odd(i0) ⊦ (even(i) ∧ even(i0) ∨ odd(i) ∧ odd(i0)) ∧ even(i1 + i2)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information