skudi experimental gismu

x1 is a logical XOR/mutual-contradiction/exclusive disjunction statement saying that only/exactly one of x2 and x3 can be true at any given time.

This word is to jonai as kanxe is to je. x2 and x3 are symmetric with regard to exchange. See also vlina, jo'ei'i.

In notes:

x1 (set, list) excludes/does not contain x2.