
| Lĩnh vực: toán & tin |
| Lĩnh vực: vật lý |
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Xem thêm: four, 4, IV, tetrad, quatern, quaternion, quaternary, quaternity, quadruplet, foursome, Little Joe, quartette, quartette, quadruplet, quadruple, quartette, foursome, quartette
n.
he joined a barbershop quartet
the foursome teed off before 9 a.m.