Goal:
    a : byte  b : byte  e : NoConfusion_byte a b
  ============================
   (noConfusion_byte_obligation_2 a b (noConfusion_byte_obligation_1 a b e) =
    e)


DEBUG:Going to execute:
repeat match goal with
                  | H:?X = ?Y |- _ => subst X || subst Y
                  end