Consider the propositions: C(x) is "x has a computer"; T(x) is "x has a textbook"; and F(x,y) is "x and y are friends" where the domain is the set of students in a class. Using these propositions and quantifiers, write the logical expression for each of the following: Make sure that all variables used are quantified. There is a student who does not own a computer and does not own a book, but who has a friend who owns a book or owns a computer. All students have a computer, but not all students have a textbook. There is a student who has no friends other than himself.