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Python 2, 46 bytes lambda m,n:[range(n*_,n*_+n)for _ in range(m)] Try it online!
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# [Python 2], 46 bytes <!-- language-all: lang-python --> lambda m,n:[range(n*_,n*_+n)for _ in range(m)] [Try it online!][TIO-l2kmlwj3] [Python 2]: https://docs.python.org/2/ [TIO-l2kmlwj3]: https://tio.run/##K6gsycjPM/pfUJSZV6LxPycxNyklUSFXJ88quigxLz1VI08rXgeItfM00/KLFOIVMvMUIBK5mrH/NTWMdIw1/wMA "Python 2 – Try It Online"