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When I press ^K in my vim while I'm in insertion mode a '?' appears and then if I press a and then another character some strange characters appear the following are a few of the characters I could get that way:

さたåだả۹۸あァǡ۸åさя

So What is happening here?

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It allows you to enter a digraph — it's a method of entering a more extensive range of Unicode characters using pairs of keystrokes. (See :h digraphs)

For future reference, you can find out what insert mode keystrokes do with commands such as: :h i_CTRL-K.

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