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6:56 AM
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3 hours later…
9:56 AM
@ChaseRyanTaylor: Several of the most recent questions by Letnikov are part of a take-home exam that I gave him and his classmates last Friday...When I encouraged them to work jointly in the problems, I certainly was not expecting them to pose them here. What a pity! — José Hdz. Stgo. Jun 22 at 19:09
 
10:19 AM
D1, D2, D3.
D4, D5, D6.
D7, D8, D9.
C1, C2, C3.
C4, C5, C6.
 

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