Briefly describe the differences (and any similarities) involved in the following contracts

1. a numbered ticket provided by a valet parking attendant or dispensed by an automated machine at the entrance to a parking structure
2. a boilerplate agreement provided by a cellular provider to subscribers or by a bank to credit card account holders
3. the oral exchange at a restaurant when a waiter takes your order for dinner
4. a formal contract such as a lease agreement for office space