data whileTestState  : Set where
  s1 : whileTestState
  s2 : whileTestState
  sf : whileTestState

whileTestStateP : whileTestState → Envc →  Set
whileTestStateP s1 env = (vari env ≡ 0) /\ (varn env ≡ c10 env)
whileTestStateP s2 env = (varn env + vari env ≡ c10 env)
whileTestStateP sf env = (vari env ≡ c10 env)