When trying a right click search for "grace" (such as "χάριν" in Gen 6:8) in the LXX* the following comes up: <Lemma = lls/el/ξάρις>
Shouldn't it be: <Lemma = lls/el/χάρις> ?
It seems like the chi was switched with an xi.
(Though I am no Greek scholar.)
*This includes: Rahlfs' LXX, Septuagint with Logos Morphology