x1 does x2 [ka with two blanks] to itself; x1 is in relation x2 with itself.
An alternative form of sefsi so it can take up the combining form *-sem-*, alongside the *-se'i-* this word already has unofficially (compare simxu, with both *-sim-* and *-si'u-*). *semlu'i* or *lumse'i* 'to wash oneself, take a bath'; *spose'i* 'self-destruct'...