premise: Seven men are preparing to operate a helicopter. hypothesis: Two instructors are teaching a small class of five how to fly a helicopter.
neutral: Not all small class have five students and two instructors.|neutral: Seven men are preparing to operate a helicopter doesn't imply that a a small class of five  are learning how to fly a helicopter.|neutral: Just because seven men are preparing to operate a helicopter, doesn't mean two instructors are teaching a small class.