Doriane Olewicki: implementation of the two challenges#12

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olewicki wants to merge 2 commits intoMathieuNls:masterfrom

olewicki:master

Commits on Feb 4, 2019

Doriane Olewicki: implementation of the two challenges
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Commits on Feb 7, 2019

correction bug file list and factorization of the code
olewicki
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