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?. La-somme-préfixe, ´ etant donnée une opération associative ?, la somme préfixe d'un flux d'entrée S = [s 0 , s 1 , s 2 , . . . , s n?1 ] est scan(?, S) = [I, s 0 , (s 0 ? s 1 ), (s 0 ? s 1 ? s 2 )