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# [Python 3], 20 bytes <!-- language-all: lang-python --> lambda l:len({*l})<2 [Try it online!][TIO-ks7io84u] [Python 3]: https://docs.python.org/3/ [TIO-ks7io84u]: https://tio.run/##K6gsycjPM/6fZhvzPycxNyklUSHHKic1T6NaK6dW08bof1p@kUKOQmaeQnS0oQ4UxupEG4BZZjrmQDaIb6hjBIJAlrEOEAJpCx2L2FgrhYKizLwSjRwdhTSNHE3N/wA "Python 3 – Try It Online"