Stream of consciousness rationale: People by stairs doesn't automatically imply they are on an escalator.
The question and answer pair are described below.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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Q: Given the sentence "People going up an escalator in the mall." is it true that "A crowd by some stairs."?
A: it is not possible to tell