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Walks list with List.iteri, checking if target - x is already in the hashtable; if yes, the earlier index plus current is the answer; otherwise record the current pair. twosum [2;7;11;15] 9 = (0, 1) 2+7 twosum [3;2;4] 6 = (1, 2) 2+4 twosum [3;3] 6 = (0, 1) 3+3 Sum of i+j over each pair: 1 + 3 + 1 = 5. Tests Hashtbl.find_opt + add (the iter-99 cleanup), List.iteri, and tuple destructuring on let-binding (iter 98 'let (i, j) = twosum ... in'). 63 baseline programs total.