On grammatical class:

ja'a
bridi logical affirmer; scope is an entire bridi.
na
bridi contradictory negator; scope is an entire bridi; logically negates in some cmavo compounds.
ja'aru'e
weak bridi affirmation; barely; almost not at all.
naru'e
weak bridi negation; almost, but not quite.

In notes:

ja'ai
affirm last word: attached to cmavo to affirm them; denies negation by nai whenever it is applicable.