Let S(x,y) mean that student x is taking the coursey, where the domain for x consists of all students in your dass, and the domain for y consists of all courses offered by the instructor. Express the following in a simple English sentence. a) xy(S(x,y)) b) x(S(x,CS3653)S(x,CS2433)) c) xyz((x=y)(S(x,z)S(y,z)))