Presto
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From 2-faced lines: centers Scoot Back and Press Ahead to become #1 and #2 of columns. Ends do a Tandem Cross Fold to become #3 and #4.
\sxvlines{b1e,g1e,g2w,b2w}
\syhlines{b2e,b3e,g3e,g2e}
1
3
1
3
2
4
2
4
2
4
3
1
3
1
2
4
before Presto
after
If done from waves, a collision occurs, resulting in "clumps".
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