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Question: how to choose polynomials containing given variables from a list of polynomials?

Hi, all, I have a list of polynomials and then I want to get polynomials which include given variables. How can I do this? For example, I have a list: L:=[a+b+c,x+ab+d^3,y+c]; and I am only interested in polynomials which include varaibles "a", "b", "c", which is "a+b+c". Which command can implement this? thanks Gepo
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