$1$ E$/$R Diagrams and Constraints$1.(20$ points$)($a$)(10$ points$)$ Design an E$/$R diagram describing the following domain: A Person has attributes pid $($key$)$ and name. A Skier is a type of Person with attribute aptitude. A Snowboarder is a type of Skier. A PairOfSkis has attribute sid $($key$)$ and model. A Snowboard has attribute sid $($key$)$ and model. A Skier owns zero or more PairOfSkis. The ownership relation has a pur$-$chase$\_$price. A PairOfSkis is owned by at most one Skier. A Snowboarder owns zero or more Snowboards. The ownership relation has a purchase$\_$price. A Snowboard is owned by at most one Snowboarder. a Person can rent a PairOfSkis or a Snowboard. A person cannot rent more than one PairOfSkis or one Snowboard at the same time. A person cannot rent a PairOfSkis and a Snowboard at the same time either. A piece of equipment. can be rented by at most one person at a time. The rental comes with a start date and an end date.

I want to know if i managed to do the assignement good, or i need some improvement