// Introducing graph theory in discrete
Rose: In here, edges mean friendship.
// Later, discussing multiple edges between the same nodes
Rose: Guang, should I give the PG-13 or PG explanation?
Rose: Or the R explanation?
// Starts explaining
Rose: *draws two nodes and an edge* So these people, at work, have a collegial relationship. *draws another edge* But behind closed doors, on the weekends, they might also have a secret sexual relationship.
// Class starts laughing
Rose: *drawing a loop* You can also be friends with yourself.