Modify the ERD you created in Problem $25$ to eliminate the problems created by the use of synonyms. $($Hint: Modify the CHARTER table structure by eliminating the CHAR$\_$PILOT and CHAR$\_$COPILOT attributes; then create a composite table named CREW to link the CHARTER and EMPLOYEE tables. Some crew members, such as flight attendants, may not be pilots. That's why the EMPLOYEE table enters into this relationship.$)$