Cryptarithms
A cryptarithm is a type of mathematical puzzle in which most if not all digits in a mathematical expression, such as a sum, are substituted by letters or other symbols.
In a typical puzzle, there is a one-to-one correspondence between the numbers and letters or symbols replacing them.
I enjoy the easy and medium ones.
For example, 5 + 5 + 5 = 15, based on a + a + a = ba and 9aa + aa + aa = bac.
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