Premise: "A doberman biting a blue ball on a grassy surface."\nHypothesis: "A doberman is a grassy surface."\nDo we know that the hypothesis entailed by the premise?
Let's think step by step.
it is not possible to tell
The fact that a doberman biting a blue ball on a grassy surface doesn't imply that a doberman is a grassy surface.

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The answer is it is not possible to tell