Batabase ER Diagram

You're working on a simple social network and want to store information on how people are related. This will center around a (recursive) "is friends with relationship between two People, and a "likes" relationship between a Person and some Thing (an entity). The "is friends with relationship is between a single person and many people on the other side. The "likes" relationship is many-to-many. Each Person will have a Name and a UserID. The UserID can uniquely identify a given Person. Note: You may only use one Person entity A is an entity. It has an attribute, "a_id" as its identifier. Bis a weak entity that depends on A. It has b_id" as its discriminator. Many instances of B may belong to the same instance of A