Combinatorics
Combinatorics is the branch of mathematics concerned with counting, arranging, and studying finite or discrete structures. It includes permutations, combinations, graphs, and optimization problems.
French writer Raymond Queneau's book 'Cent mille milliards de poèmes' cuts 10 sonnets into 14 horizontal line-strips you flip separately. Since all share one rhyme scheme, any mix is still a sonnet: 10^14 — 100 trillion — poems. One a minute, nonstop, takes about 190 million years.
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