Harley tells a variety of offensive and inoffensive jokes to coworkers at lunchtime who laugh at all of the jokes, telling Harley that he's funny. When Harley tells jokes at the evening meal to housemates, they complain to Harley about the offensive jokes. If the behavior analyst wants the evening meal with housemates to become an S∆ for Harley's offensive joke-telling, she should instruct Harleys'?