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potwarchive
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curl --silent https://web.archive.org/web/20210609154329/https://brilliant.org/weekly-problems/2018-12-17/basic/ | egrep -oi 'data-solvable="([0-9]+)"'
https://web.archive.org/web/20210609154118/https://brilliant.org/weekly-problems/2018-12-17/basic/
https://web.archive.org/web/20210609154118/https://brilliant.org/weekly-problems/2018-12-10/basic/
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