Let A and B be two entities in an E-R diagram, each having only simple…

Let A and B be two entities in an E-R diagram, each having only simple single-valued attributes. R1 and R2 are two relationships between M and N. R1 is one-to-many from A to B. R2 is many-to-many from A to B. What is the minimum number of tables required to represent A, B, R1 and R2 in the relational model?