Rip the Line
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Think "Pair and Cross Pair" — that is, Centers Pair the Line (U-Turn Back) while the ends Cross Pair the Line (Cross Fold).
\syhlines{b2n,g2n,g3n,b3n}
\sxvlines{b2s,g3s,g4n,b1n}
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before Rip the Line
after
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