From a wave or line: Quarter away from the center of the line ("Lines
Divide"), and individually "Peel" in flow direction, adjusting to
couples.
\phfour{b2n,g2s,g3n,b3s}
\phfour{b2w,g2w,g3e,b3e}
\phBB{g2e,b2e,b3w,g3w}
before Roll the Wave
after 1/4 away
finished
This is now also called Roll the Line when the formation is not a wave.
It may be useful to think of Roll the Line / Wave as: U-Turn
Back away from the center of the wave, and then either Explode or Bend
the Line, as applicable.
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