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A dollar bill serial number is a 1 0 - character string that starts with a letter from the 1 2 element set { A
A dollar bill serial number is a character string that starts with a letter from the element set
A B C D E F G H I, J K L followed by an digit string each digit from the set of digits
and ending with a letter or a star from the element set:
A B C D E F G H I, J K L M N P Q R S T U V W X Y
How many serial numbers are palindromes?
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