Bill performs plumbing upgrades for Alice $in$ exchange for her hair cut service, then their ${?}_{(}{)}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}}$ will $be$ satisfied

Question $26$ options:

$a$