The most interesting result of a study of Murngin kinship morphology [says Warner] is the "urge" for symmetry. One feels this in the native mind, too. There is always an unconscious and frequently a conscious desire to "keep the gurratu [kinship system] straight."1

1Warner, W.L.n/an/an/an/a, "Morphology and Functions of the Australian Murngin Type of Kinship," Amer. Auth., N.S., 32: 211.