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Corrections and improvements#4

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timguoqk wants to merge 3 commits intomofaph:masterfrom

timguoqk:master

Commits on Apr 20, 2015

remove redundant condition in ex2-72
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Commits on Apr 29, 2015

improve grammar
timguoqk
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Commits on May 4, 2015

correct answers for ex2-88
timguoqk
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