On grammatical class:

bi'e
prefixed to a mex operator to indicate high priority.

In definition:

cmavrbi'e
x1 is the selma'o "BIhE".

In notes:

pa zei meksota
x1 is a part of Lojban text representing rule 'mex-1' according to the first edition of the book 'The Complete Lojban Language'.