GI (http://www.lojban.org/en/publications/reference_grammar/chapter14.html)

Separates two logically or non-logically connected sumti, tanru units,
bridi-tails, or other things, when the prefix is a forethought logical connective
involving GA, GUhA, or JOI.

ge la djan. nanmu gi la djeimyz. ninmu (It is true that) both John is a man
and James is a woman.

