Phase #4 begins at the end of Year #1. Maybe if you hit some speed bumps it will take a little over a year to complete Phases #1-3. Or maybe you're a study master, and you'll get to Phase #4 in 8 months. Whatever the case, reaching Phase #4 is an occasion for celebration. If you've made it this far, then your mind is super-prepped for fluency. You are officially Jouzu.

Jouzu

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上手

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“skilled; good (at)"

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上 (above) + 手 (hand)

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upper hand

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pro status; shark ninja-esque

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something Japanese people will tell you that you are the second you learn to say Konnichiwa, but a distinction that you won't feel is deserving until you've done a ridiculous amount of studying.