m how many distinc ways can the letter of the word MAMAS be arranged?

To find the number of distinct ways the letters of the word MAMAS be arranged:

If we had 5 unique letters such as CARES, we'd be able to arrange the letters in 5! = 120 ways. (We'd have 5 choices of what the first letter could be, 4 choices for the next letter, 3 choices for the next etc..... giving $5\times 4\times 3\times 2\times 1=5!=120$.

There are 2 sets of letters where there are more than 1 i.e., we have two M's and two A's.