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 9v0060b82e38000000000208

Transpose a python matrix

Rotate the matrix in 90 degrees.

Start file

((1, 2, 3, 4),
 (5, 6, 7, 8),
 (9, 10, 11, 12),
 (13, 14, 15, 16))

End file

((1, 5, 9, 13),
 (2, 6, 10, 14),
 (3, 7, 11, 15),
 (4, 8, 12, 16))

View Diff

1,4c1,4
< ((1, 2, 3, 4),
<  (5, 6, 7, 8),
<  (9, 10, 11, 12),
<  (13, 14, 15, 16))
---
> ((1, 5, 9, 13),
>  (2, 6, 10, 14),
>  (3, 7, 11, 15),
>  (4, 8, 12, 16))

Solutions by @37fatos:

Created by: @Kyle98675198 Tweet

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Solutions by @37fatos: