sentences:  The tradition of "pennying" is long established in most Cambridge, Oxford, St Andrews and Durham colleges/halls, although is banned in some colleges, such as Keble College, Oxford and Pembroke, Cambridge whereas in others there is often the risk of possible expulsion from the meal by staff members and even fines at St Chad's College, Durham.A variation of the tradition is found at University College, Durham, where corks are used instead of pennies.In some Cambridge colleges, Smarties are used as an alternative, due to the request of the kitchen staff (pennies apparently being a problem in dishwashers).