Consider the question. Test for natural language inference.
Premise: "The back of two men's heads riding on a train."
Hypothesis: "The train is making the back of two mens heads bounce on the head rest."
Is the hypothesis entailed by the premise?
Options:
- yes
- no
- it is not possible to tell
 If the answer is 'it is not possible to tell'; explain the reasoning:
Riding on a train doesn't imply that the men's heads bounce.