Letterbox
Make a box!
Start file
abcdefg
End file
a b c d e f g b f c e d d e c f b g f e d c b a
View Diff
1c1,7 < abcdefg --- > a b c d e f g > b f > c e > d d > e c > f b > g f e d c b a
Solutions by @Smylers2:
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