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 54cb9296b2df9e000307809a

Winning streak

Make the number on each line equal the consecutive L's or W's.

Start file

W 1
W 1
W 1
L 1
L 1
W 1
L 1
L 1
L 1
W 1
W 1
W 1
L 1
W 1
W 1
W 1
W 1
L 1
L 1
L 1

End file

W 1
W 2
W 3
L 1
L 2
W 1
L 1
L 2
L 3
W 1
W 2
W 3
L 1
W 1
W 2
W 3
W 4
L 1
L 2
L 3

View Diff

2,4c2,3
< W 1
< W 1
< L 1
---
> W 2
> W 3
5a5
> L 2
8,11c8,9
< L 1
< L 1
< W 1
< W 1
---
> L 2
> L 3
12a11,12
> W 2
> W 3
15,19c15,17
< W 1
< W 1
< W 1
< L 1
< L 1
---
> W 2
> W 3
> W 4
20a19,20
> L 2
> L 3

Solutions by @pedrosans:

Created by: @udioica Tweet

51 active golfers, 135 entries

Solutions by @pedrosans: