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Let's break it down!
Each letter's value corresponds to their position in the alphabet.
B is 2, R is 18, S is 19
Then add the letter's value to the number preceding it.
3B = 3 + 2 = 5
8R = 8 + 18 = 26
2S = 2 + 19 = 21
Therefore, 9A would be 9 + A = 9 + 1 = 10!
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