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 @kentyuan:
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