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http://blog.amit-agarwal.com/2010/08/02/when-you-press-f9-paste-is-on-press-f9-again-and-paste-is-off-and-so-forth-works-in-insert-mode-and-command-mode/
when you press f9 \'paste\' is on , press f9 again and \'paste\' is off, and so forth (works in insert-mode and command-mode)