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JavaScript (Node.js), 78 bytes (m=(a,b=26,c=a(--b))=>b?[c,...m(a,b),c]:[c])=>m(a=>m(b=>(c=25-a-b)<0?32:c+65)) Try it online!
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# [JavaScript (Node.js)], 78 bytes <!-- language-all: lang-javascript --> (m=(a,b=26,c=a(--b))=>b?[c,...m(a,b),c]:[c])=>m(a=>m(b=>(c=25-a-b)<0?32:c+65)) [Try it online!][TIO-kkwambxn] [JavaScript (Node.js)]: https://nodejs.org [TIO-kkwambxn]: https://tio.run/##FYzBDoMwDEN/hRuJ1kYTExzQAtJ@g3FIMzqBoEWw7fdZuViyn@1JfrLrNq4fG@JrODwfsDCIcVxURlnAWofIjWs7NUS0nAyN9nWnfcqTP8VxA8pFaSXV79f2VtR6qUrEQ2PY4zzQHN/gAWmRFSTjJnt8vR828ltMH4g0xTFA/gx5Gv0B "JavaScript (Node.js) – Try It Online"