| dentition, teeth; singleton; pair, brace; trio, triad, triplet; quartet, quartette, quadruplet; quintet, quintette; sextet, sextette, sestet; septet, septette; octet, octette; chess set; manicure set; union, sum, join; intersection, product, cartesian product; field; field; field; bracket; conjugation; suite; choir, consort; core, nucleus, core group; score; threescore; synset |