co'au'e CO experimental cmavo

trivial selbri inversion: does not invert tanru (seltau first/left, tertau second/right).

This is the default in Lojban and can often be elided. (Re)asserts local left-grouping if used multiple times (just as co asserts right-grouping). Mostly used in answer to co'u'o or in order to be explicit or to override grouping rules.

In notes:

co'ai'e (exp!)
Non-committal/agnostic/unassertive/abstaining/neutral tanru inversion.