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+Advent of Code 2020 (adventofcode.com) in J and Clojure.
+
+I'm using J 901.f and Clojure 1.10.1.
+
+
+To the extent possible under law, Leah Neukirchen has waived
+all copyright and related or neighboring rights to this work.
+http://creativecommons.org/publicdomain/zero/1.0/
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+nums =: [: ". [: > [: cutopen [: 1!:1 <