pc5 graded 2014.02.10
Merged pc6
Merge pc7
Merge pp1
Merge pp1
Merge pc8
Merge pc9
Merge pc10
Merge pc11.cpp
Merge pc12.cpp
pc12 graded 2014.03.12
pc13 graded 2014.03.13
Merge pull request #2 from GreatBigBore/master

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