This question may have multiple correct answers. List the symbol of each correct answer, separated by a comma. Do not reiterate the answer itself.

Question: People in the US have longer paid vacations than people in which Western countries?

Choices:
A. People in the US have the shortest paid vacations among Western countries.
B. Americans have longer vacations than Canadians.
C. Americans have longer vacations than people in England.
D. There is no country with shorter vacations. The letter a should appear at least 24 times.
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