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CnH2n+2 CnH2n CnH2n-2 CnH2n-6
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2n,2n,4n,n,n 4n,2n,n,n,n 2n,4n,2n,n,n n,4n,2n,n,2n
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2n,2n,4n,n,n 4n,2n,n,n,n 2n,4n,2n,n,n n,4n,2n,n,2n
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2N 2N 2N N N N N 2N N 2N N 2N