Flowing
<anything>
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With the Flow, and then
finish
the
<anything>
call. All of the "ing" calls (Flowing, Rolling, etc.) apply some action to the preceding call, and then let that action replace the first part of the "anything" call.
\phfour{b1n,g1s,g2n,b2s}
\phBB{g1s,b2n,b1s,g2n}
\phBB{b2n,g2n,g1s,b1s}
\pvfour{b1e,g2w,g1e,b2w}
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before Recycle
before Flowing Contour the Line
after Flow
finished