Real Vim ninjas count every keystroke - do you?

Pick a challenge, fire up Vim, and show us what you got.

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$ gem install vimgolf
$ vimgolf setup
$ vimgolf put 9v006621a9a900000000026b

New teacher

Update the details of the new CS teacher.

Start file

firstname,lastname,age,hair,eyes
rose,jetson,10,brown,brown
rob,thomson,9,ginger,brown
peter,smith,10,brown,blue
mr,walker,50,none,brown

End file

firstname,lastname,age,hair,eyes
rose,jetson,10,brown,brown
rob,thomson,9,ginger,brown
peter,smith,10,brown,blue
mr,kershaw,53,brown,brown

View Diff

5c5
< mr,walker,50,none,brown
---
> mr,kershaw,53,brown,brown

Solutions by @DontBeAlarmed:

Created by: @johnkershaw Tweet

300 active golfers, 1423 entries

Solutions by @DontBeAlarmed: