3. Predicates W(x) (white) and B(x) (black). In the game of chess, consider the premise "Each piece is either white or black." Prove that you can conclude from this that in chess "Any piece which is not white is black." 4. Predicates B(x) (bird), R(x) (reptile), M(x) (mammal), L(x) (lion). Prove the following logical implication "No bird or reptile is a mammal. All lions are mammals. Therefore, no lion is a bird