It is, but the existence of underrepresented groups is not a necessity. That is, there is no requirement that there be an underrepresented group. But if there i

It is, but the existence of underrepresented groups is not a necessity. That is, there is no requirement that there be an underrepresented group. But if there is an underrepresented group, then it is a necessity that not enough people from that group are present. What I'm really trying to say is, that particular phrase is repetitious, but not useless.