Use vim to make special characters

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If you want to make special characters in vim like æ ø å, it's possible directly in vim, it works like this.

While you are in Insert mode type "CTRL-K" and the two letter character code, so if i wanted to make "æ" i would type "CTRL-K ae", if i wanted to make "ø" i would type "CTRL-K o/" and if i wanted to write "å" i would type "CTRL-K aa"