kinda cheating if you allow comments lines as part of the palindrome
Not really. The definition of palindrome does not require that letters or words have some special meaning besides their order. Moreover, the problem author adds a comment section to the default solution that tips using comments as an expected kind of behavior. Finally, all valid solutions to this problem so far use comments except people that identify their own file and mark it as valid palindrome or use some hack (and that's cheating.)
Select every other element of a vector
Project Euler: Problem 9, Pythagorean numbers
Flip the main diagonal of a matrix
Divisible by 5
linear least squares fitting
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