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* add DayFactory and cli options for dayBen Harris2019-12-026-16/+71
* speed up day2part2, tidy up a bitBen Harris2019-12-021-31/+8
* day2Ben Harris2019-12-023-0/+88
* add READMEBen Harris2019-12-011-0/+7
* day1 initBen Harris2019-12-015-0/+194