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May I use the @ operator?
Yes, but you should try solve without it (which is possible)
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May I use the mod function?
Yes.
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Should palindrome be case sensitive?
Yes.
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Can I use helper functions?
Yes.
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Are we allowed to use the functions we defined ourselves?
Yes (and you should be).
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What should palindrome return for ""?
True.
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Do we have to handle negative numbers in digitsOfInt ?
No - read the assignment. This is handled in the digits function.