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)