Although they knew each other from school; although their groups were defined by flimsy, irrelevant criteria; and although self-interest was not served; they discriminated faithfully.
They did not discriminate each other.
mnli hypothesis: They did not discriminate each other. premise: Although they knew each other from school; although their groups were defined by flimsy, irrelevant criteria; and although self-interest was not served; they discriminated faithfully.