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2.1
2.4, page 55
2.1.1
problem 1
2.1.2
problem 2
2.1.3
problem 3
2.1.4
problem 4
2.1.5
problem 5
2.1.6
problem 6
2.1.7
problem 7
2.1.8
problem 8
2.1.9
problem 9
2.1.10
problem 10
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