On grammatical class:

ga'o
closed interval bracket marker; mod. intervals in non-logical connectives; include boundaries.
ke'i
open interval bracket marker; modifies intervals in non-logical connectives; exclude boundaries.
ma'a'u'oi
interval endpoint status question marker
xai'u'oi
interval endpoint status (exclusive/inclusive) marker: independent of the other, all options satisfy
xau'u'oi
elliptical/vague interval endpoint status (exclusive/inclusive) marker
xei'u'oi
interval endpoint status (exclusive/inclusive) marker: dependent and coincident/matching with other
xoi'u'oi
interval endpoint status (exclusive/inclusive) marker: dependent and contrary/contraposed with other

In definition:

cmavrga'o
x1 is the selma'o "GAhO".

In notes:

vau'e'oi
interval bracket ordered tuple introducer
joik zei uanta
x1 is a part of Lojban text representing rule 'joik' according to the first edition of the book 'The Complete Lojban Language'.