**number of relations**

- for each entity 1 relation
- For M:N 3 relation
- for multivalued attribute 1 relation
- for each n-ary(>2) relationship 1 relation

so

____E1(__A1__,A2)

E4(__A1__,__A9__,A10)

E3(__A3__,A4)

E2(__A5__,A6,A7,A17,A11)

R1(__A8,__A3,A5,A1)

E5(__A11__,A12)

E6(__A13__,A15)

E7(__A13__,A14)