Translate the following into mathematical expressions, using predicate logic. Only Universal and Existential quantifiers are allowed. Clearly define the predicate functions and the domain of the variables:

(e) Some students in this class have visited at least two cities other than Montreal. (f) There is no city that every student in this class has visited. (g) Not every two students have a common friend. (h) There are two students in this class, who between them, have a friend in every country in the world