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1·In particular, we investigated four treatments: one with primarily a few large denomination bills, one with several small denomination bills, one with a large amount of coinage, and one empty.

具体说来，我们调查研究了四种情形：一种是几张面额相当大的钞票，一种是若干小面额的钞票，一种是大量的硬币，还有一种就是空箱子。