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problem 1
problem 2
problem 3
problem 4
problem 5
problem 6
problem 7
problem 8
problem 9
problem 10
problem 11
problem 12
problem 13
problem 14
problem 15,16
problem 17
problem 18,19
problem 20,21,22
problem 23,24
problem 25,26
problem 27
problem 28,29
problem 30
problem 31
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