What are the differences among 준비하다, 갖추다, and 마련하다?
I have a sense they are variations of "to prepare." Are they used in different circumstances? Examples? Many thanks in advance.

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Answer

I think 준비하다 is more like make it ready?
준비하다 - 시험을 준비하다 / 생일 파티를 준비하다
I think 갖추다 feels like qualified 갖추다 - 자격을 갖추다

I think 마련하다 means to have, get, prepare something for some situations such as marriage or someone 
마련하다 - 집을 마련하다

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