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Homework answers / question archive / Chef has a sequence of integers A1,A2,
A1,A2,...,AN. He takes a sheet of paper and for each non-empty subsequence B
B of this sequence, he does the following:
For each integer between 1
1 and N
N inclusive, find out how many times it appears on Chef's sheet of paper. Since these numbers may be very large, compute them modulo 1,000,000,007
1,000,000,007 (10
9
+7
109+7).