Q$1.$ Consider the following set of simplified requirements for a LOL database that is used to keep track of the interactions between heroes, skills and equipments. $($i$)$ Each hero has a unique hero ID$,$ hero name, gender, and e$-$mail. Each hero must own several skills. A hero may buy several equipments. $($ii$)$ Each skill has a unique skill ID and a skill name. A skill may be owned by only one hero. A skill may be supported by an equipment. $($iii$)$ Each equipment has a unique equipment number, subject and content. An equipment may be bought by several heroes. An equipment can be used to support several skills.