[Cross] Pair the Line
Centers U-Turn Back while the ends Fold.
On a Cross Pair the Line, the centers Trade while ends Cross Fold.
The Fold makes this a semi-space-invader. Breathing takes place laterally
(relative to the Fold), but not front-to-back.
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\sxhlines{g3s,b1n,b4s,g2n} | \sxvBBBs{...,g2s,b1s,b4n,g3n,...} |
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| before Pair the Line | after |
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\sxhlines{b2s,g1e,g2w,b1s} | \sxvBBBs{...,...,g1w,g2e,b2n,b1n} |
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| before Pair the Line | after |
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\syhlines{b2n,g2s,g3n,b3s} | \syvBBBs{b2s,...,g2n,g3s,...,b3n} |
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| before Cross Pair the Line | after |
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