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Three small functions: hist xs build a Hashtbl of count-by-value max_value h Hashtbl.fold to find the max bin total h Hashtbl.fold to sum all bins For the 15-element list [1;2;3;1;4;5;1;2;6;7;1;8;9;1;0]: total = 15 max_value = 5 (the number 1 appears 5 times) product = 75 Companion to bag.ml (string keys) and frequency.ml (char keys) — same Hashtbl.fold + Hashtbl.find_opt pattern, exercised on int keys this time. 71 baseline programs total.