Working in rows, from left to right, in the top row add 3 to the numerical value of the first letter to give the next one along, then 4, then 5. In the next row, add 5 to the first letter, then 6, then 7. In the third row, start by adding 7, then 8, then 9, and in the bottom row, add 9, then 10, then 11.
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