day09.ijs - adventofcode2020 - Advent of Code 2020 (adventofcode.com) in J and Clojure

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1 2	`]a=:d{~25+0 i.~({:e.[:,[:+/~}:)"1 (26,\d=:(".;._2)1!:1<'day09') NB. 138879426 +/(<./,>./)(1=(/:~{.($#:I.@:,)a=-/~+/\d)I.i.#d)#d NB. 23761694`