NASA 1wants to be able to discr'mn'nate between Martians (M) and Humans {H} based on the following characteristics: lGreen E {N, Y}, Legs E {2, 3}, Height E {ET}, Smell}? E {N, Y}. Our available training data is as fellews: Species Green Legs Height Smelly 1) H H 3 3 T 2) H Y 2 T H 3) H Y 3 T H 4) H H 2 S T 5) H T 3 T H E) H H 2 T '1' T) H H 2 S H 3) H H 2 T H 9) H Y 2 S H 13) H H 2 T '1