8.2 follow up#15

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KamillaKhabibrakhmanova wants to merge 4 commits intoseemaullal:masterfrom

KamillaKhabibrakhmanova:8.2_followUp

Commits on Jul 2, 2016

problem 17.1
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Commits on Jul 3, 2016

problem 18.1
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Commits on Jul 29, 2016

solution to 3.7
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Commits on Aug 6, 2016

follow up solution
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