simp [bitwise_getBit]
case a
l m n i : Nat
⊢ getBit (bitwise and l (bitwise bne m n)) i = getBit (bitwise bne (bitwise and l m) (bitwise and l n)) i
case a
l m n i : Nat
⊢ (getBit l i && getBit m i != getBit n i) = ((getBit l i && getBit m i) != (getBit l i && getBit n i))