Not really my solution... just a slightly cheating version of @bmtran's.
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Project Euler: Problem 4, Palindromic numbers
letter yes yes & letter no no
"Look and say" sequence
Back to basics 20 - singleton dimensions
7 segment LED display
Back to basics 5 - Clipboard
Back to basics 17 - white space
Back to basics 8 - Matrix Diagonals
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