x1 is group/cluster/team showing common property (ka) x2 due to set x3 linked by relations x4.
Also collection, team, comprised of, comprising; members x3 (a specification of the complete membership) comprise group x1; cluster (= kangri). See also bende, ciste, cmima, gunma, panra, cabra, cecmu, kansa, klesi, lanzu, liste, vrici.