In this project, you are to implement a Set ADT in Java using a singly linked list. The data type of the elements of your set should be String type. We assume that all the sets are simple; a set does not contain another set.

Your ADT should include the following operations:
- Insert an element in a set. Make sure all the elements of a set are unique.
- Remove an element of a set.
- Membership: Check whether an element belongs to a set.
- Test whether a set is a subset of another set.
- Compute the cardinality of a set. What is the cardinality of an empty set?
- Intersection of two sets.
- Union of two sets.
- Find the difference of two sets.
- Power Sets: Generate the power set of a given set.
- Cartesian product of two sets.

Deliverables
1. All code used for implementing you ADT (linked implementation).
2. Specification and implementation of your program.
3. Listing of your implemented test plan, and of the output produced by your program. Include at least 12 different test cases, some of which are invalid input.