Kenneth L. Bingaman was charged with three counts of sexual abuse of a minor in the second degree,2 a class B felony, for conduct spanning more than a year and involving S.H., the daughter of his live-in girlfriend.   A grand jury also charged Bingaman with one count of assault in the third degree,3 a class C felony for conduct involving K.H., S.H.'s mother.   At trial, the state gave notice of its intent to introduce evidence pursuant to Rule 404(b)(4) of several prior incidents of assault involving Bingaman and several members of the victims' household.