they would be of the format XYYX
where X varies from 2 to 4
and Y varies from 0 to 9 for each value of X.
for a total of 3 * 10 combinations = 30
starting at 2002
ending at 4994
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48 palindromes.
40 palindromes.
Forty palindromes.
99 palindromes.
198 palindromes.