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Possible Duplicate:
“all but at most one” - What does it mean?

When a sentence has this phrase: "....which all but one refused to do."

Does it mean all refused to do and only one did it? Or does it mean everyone did it, except one didn't?

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It means that all refused to do and only one did it. Sometimes rearranging the structure helps to clarify: "all refused to do [it] but one."

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