$3\mathrm{.}1$ Draw an ER diagram segment to represent the following requirement: a part can

contain zero or more parts, and a part can be part of $($contained in$)$ zero or more parts.

Assume that each part has a part number $($primary key$)$ and part name. Make sure to

include the multiplicity and a description of the multiplicity. Then use reduction

techniques to map the ER diagram to relational schemas