You want to see data on charters flown by either Robert Williams $($employee number $105)$ or Elizabeth Travis $($employee number $109)$ as pilot or copilot, but not charters flown by both of them. Complete Problems $29-31$ to find this information.

$29.$ Create the table that would result from applying the SELECT and PROJECT relational operators to the CHARTER table to return only the CHAR$\_$TRIP, CHAR$\_$PILOT, and CHAR$\_$COPILOT attributes for charters flown by either employee $105$ or employee $109.$

$30.$ Create the table that would result from applying the SELECT and PROJECT relational operators to the CHARTER table to return only the CHAR$\_$TRIP, CHAR$\_$PILOT, and CHAR$\_$COPILOT attributes for charters flown by both employee $105$ and employee $109.$

$31.$ Create the table that would result from applying a DIFFERENCE relational operator of your result from Problem $29$ to your result from Problem $30.$