On grammatical class:

fe'u
elidable terminator: end nonce conversion of selbri to modal; usually elidable.

In definition:

cmavrfe'u
x1 is the selma'o "FEhU".

In notes:

filtoda
x1 is a part of Lojban text representing rule 'tense-modal' according to the first edition of the book 'The Complete Lojban Language'.