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Haskell, 78 bytes main=putStr$reverse$a++show a where a="main=putStr$reverse$a++show a where a=" Try it online!
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# [Haskell], 78 bytes <!-- language-all: lang-hs --> main=putStr$reverse$a++show a where a="main=putStr$reverse$a++show a where a=" [Try it online!][TIO-ktu17db9] [Haskell]: https://www.haskell.org/ [TIO-ktu17db9]: https://tio.run/##y0gszk7Nyfn/PzcxM8@2oLQkuKRIpSi1LLWoOFUlUVu7OCO/XCFRoTwjtShVIdFWiUhl//8DAA "Haskell – Try It Online"