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If I write out the answer to a problem and put it on GitHub, then I can easily win a challenge by simply writing code to fetch the answer. Is this valid? I've never seen it been forbidden in a challenge's rules.

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    \$\begingroup\$ Fetching output from external sources is one of the standard loopholes. \$\endgroup\$ – El'endia Starman Jan 14 '17 at 18:57
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    \$\begingroup\$ The reason you've never seen it forbidden in a challenge's rules is because it's seen as a standard loophole, e.g. loopholes which may be assumed to be closed without the question-setter having to explicitly close them. This particular loophole is listen on our page of standard loopholes as the second highest answer. \$\endgroup\$ – James Jan 14 '17 at 18:57

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