7. Given the E-R diagram shown below, give a database schema (i.e. list of relations) for it. The keys of each entity are shown in quotes. Research Assistant is a weak entity. Projects is a multivalued attribute in Professor Double lines mean total participation; single line, partial participation. Make sure to give the keys for each relation (primary and foreign). ssn Chairs dname bualdang salary Works Professor M- / We address number paame date-sta campus Vor Offery-- semester Teaches Research Assistant age Coursc level credits