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- Function keys <F2>, <F3>, etc.. Also the shifted function keys <S-F1>,
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<S-F2>, etc. Note that <F1> is already used for the help command.
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- Use the '_' or ',' character and then any other character. The "_" and ","
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commands do exist in Vim (see |_| and |,|), but you probably never use them.
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- Use a key that is a synonym for another command. For example: CTRL-P and
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CTRL-N. Use an extra character to allow more mappings.
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See the file "index" for keys that are not used and thus can be mapped without
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losing any builtin function. You can also use ":help {key}^D" to find out if