Not enough Ps
Different type of code
Start file
A B C D
B A X Y
B X Y D
D C B A
X D A B
B W Y D
W B D X
A B D X
D Z B Y
D Z B A
End file
A P C D
P A X Y
B X Y D
D C P A
X D A P
B W Y D
W B D X
A P D X
D Z B Y
D Z P A
View Diff
1,2c1,2
< A B C D
< B A X Y
---
> A P C D
> P A X Y
4,5c4,5
< D C B A
< X D A B
---
> D C P A
> X D A P
8c8
< A B D X
---
> A P D X
10c10
< D Z B A
---
> D Z P A
Solutions by @gigabates:
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