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r =: >"1 cut each cutopen 1!:1 < jpath '~/projects/AoC/2020/year2020day2.txt.cache'
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rs =: >0".each'-'cut"1>(0}"1 r)
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cs =: 0{"1>1{"1 r
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ss =: 2{"1 r
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+/1>**/|:rs-+/"1 cs=>ss
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+/1=+/|:(rs-1){"1 cs=>ss
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