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Linux commands (every important command, there must be a reason why it exists for more than 30 years. Who knows Python or java will stay forever?) and Bash (glue Linux commands together) (It seems Python is cool[life is short, you need Python]. But Let’s just wait. All things that not come together with Linux system, we can wait)
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Emacs (stop investing time on other text editors)
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Matlab
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Latex
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cook (sounds funny. But at the end of the day, you know the exact combination you want, both nutrition and taste)