∀ {a : Turing.ToPartrec.Code} {a_1 : Turing.PartrecToTM2.Cont'} {a_2 : Turing.ToPartrec.Code}
  {a_3 : Turing.PartrecToTM2.Cont'},
  Turing.PartrecToTM2.Cont'.cons₁ a a_1 = Turing.PartrecToTM2.Cont'.cons₁ a_2 a_3 → a = a_2 ∧ a_1 = a_3