vim go to insert mode after keymap code example

Example: vim use normal keys in insert mode

Just hold down "Alt" key!

Example:
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Suppose you are in insert mode and want to delete a line without 
switching to normal mode. 
Usually you should press dd to remove a line but in this case 
hold down Alt key and then press dd. That's it! and It's gonna 
switch to normal mode automatically.
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