As a child Dan loved to prance around the neighborhood wearing silly outfits. As he got older he realized that he couldn't continue that kind of behavior unless he found some way for it to be viewed as more socially acceptable. Having realized this Dan decided to pursue a career as a circus clown. According to Freud Dan's _____, which operates on the _____ principle, is responsible for finding a socially acceptable outlet for his desire to run around wearing silly outfits.