Hello, I'm wondering if there is a fast way to solve the following problem. I have two arrays: A = [[ 4, 9, 10], [ 7, 4, 17], [12, 21, 14], [12, 24, 11], [18, 21, 3], [16, 3, 7], [17, 21, 5], [24, 3, 14]] B = [[17, 5], [14, 21]] I need to search rows of A that contain elements of each row of B regardless of the order of the elements in B. The searched results is: [2, 6] . Thanks. Nicola -- _____________________________________________________________________ Nicola Creati Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS IRI (Ricerca Teconologica e Infrastrutture) Department B.go Grotta Gigante - Brisciki 42/c 34010 Sgonico - Zgonik (TS) - Italy Tel. +39-0402140213 Fax +39-040327307