As someone who is learning Mandarin it would probably be very limited mandarin characters.

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One of the reasons that it didn’t is specifically because of how unfriendly mandarin is (as a language) to typing. In fact, it took many years AFTER English typewriters were around for useable mandarin typewriters to be made (due to the sheer number of possible characters) — these were operated using code sheets where the operator would enter a 4 number index of each character. This made the barrier to entry for using typewriters much higher for mandarin as compared to English.

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it would evolve to smtg like pinyin too, just easier and makes more sense to even chinese people

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