Premise: "A falcon is perched on a girl's left arm as a man assists her and talks into a microphone."\nHypothesis: "A falcon is on a girls arm."\nDo we know that the hypothesis entailed by the premise?
Step-by-step reasoning:
yes
To say the falcon is on one of the girl's arms is another way to say that the falcon is perched on the girl's left arm.

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So, the final answer is yes