Question About Deceased Victims

Does anyone know if any of those who tragically lost their lives in the shooting knew each other? Like were they friends with each other? In Brooks Brown’s book he said that he was friends with some of the deceased victims, but were any of the students who did not survive the massacre friends/acquaintances with one another? Like did Daniel Mauser and Rachel Scott interact/ were friendly, for example? I’m trying to understand what the victims’ lives were like and if any of them interacted. I’ve heard of survivors talking about the victims, but what I’m asking is if any of the victims interacted with one another before the massacre.