A **magic square** is an arrangement of integers in a square grid, where the numbers in each row, column and main diagonal all add up to the same number, which is called the **magic sum**.

If we use 9 distinct numbers from 1 to 27 to make a 3 by 3 magic square, what is the most number of primes that we can use?

**Details and assumptions**

You may use the fact that there are 9 prime numbers from 1 to 27.

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