What is the purpose of Limited Government?

the answer to the question linked would be the constitution. the purpose of a limited government is so the government cannot gain too much control over it's citizens

The lists are
AM
MA
AY
YA
MY
YM
Are the six ways that these can be listed. There are 6 altogether. 
If you know what the counting principle is you can do it this way.

The first letter is any choice 3
The second letter can be one of 2
The number of ways of doing this problem is 3*2 = 6

However the question does not make clear if duplicates are allowed. We are only told that the string consists of 2 letters. They could be the same. In that case you have three more answers.

AA
MM
YY

I think the answer is intended to be 6, but it could be 9.
Use 6.<<< Answer
But don't be surprised if 9 is correct.