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A palindrome is a sequence of objects which stays the same when reversed.

Linguistic Note

The word palindrome derives from the Ancient Greek παλίνδρομος ‎(palíndromos), meaning running back again.

This is formed from πάλιν ‎(pálin), meaning back, again, and back again, and δρόμος ‎(drómos), meaning running, race, and racecourse.