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Here is an example on the set of animals
Set S = { }
Note that the elements in S are distinct and not in order

Wish to try the following operations?
1. Add an element to the set
2. Check an element in the set
3. Check the cardinality
9. Quit

Your choice: 1
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Current Set S = { }

Enter an element: Tiger
1
New Set S = {Tiger}
Wish to try the following operations?
1. Add an element to the set
2. Check an element in the set
3. Check the cardinality
9. Quit

Your choice: 1
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Current Set S = {Tiger}

Enter an element: Tiger
1
2
New Set S = {Tiger,Tiger}
Wish to try the following operations?
1. Add an element to the set
2. Check an element in the set
3. Check the cardinality
9. Quit

Your choice: 1
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Current Set S = {Tiger,Tiger}

Enter an element: Tiger
1
2
3
New Set S = {Tiger,Tiger,Tiger}
Wish to try the following operations?
1. Add an element to the set
2. Check an element in the set
3. Check the cardinality
9. Quit

Your choice: 1
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Current Set S = {
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