On grammatical class:

lo'o
elidable terminator: end math express.(mex) sumti; end mex-to-sumti conversion; usually elidable.

In definition:

cmavrlo'o
x1 is the selma'o "LOhO".

In notes:

xa zei sumtika
x1 is a part of Lojban text representing rule 'sumti-6' according to the first edition of the book 'The Complete Lojban Language'.