Premise: "A little boys is enjoying a blue lollipop."\nHypothesis: "The boy is wearing a baseball cap."\nDo we know that the hypothesis entailed by the premise?
Let's think step by step.
it is not possible to tell
In no way is that he is wearing a baseball cap implied by the fact that he is little or enjoying a blue lollipop.

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The answer: it is not possible to tell