In this task, You are given an open-domain question that can be answered based on factual information. Your task is to provide \*short\* answer (in a few words only) for the given question. The short answer can be one or more entities or it can also be boolean \*yes\* or \*no\*.

Q: what is the purpose of a lesson plan

A: guide class learning
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Q: who led an expedition to explore the louisiana territory

A: Lewis and Clark
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Q: in poland the movement against communism was led by

A:
Lech Wałęsa
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