On grammatical class:

fa'o
unconditional end of text; outside regular grammar; used for computer input.
fa'u'u'u'u'u'u'u'u
erases Lojban from spacetime continuum.
to'au
Toaq toggle: Toggles text to Toaq language; marks following text as Toaq text.

In definition:

cmavrfa'o
x1 is the selma'o "FAhO".