Flowing <anything>

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}
1 1 2 2 1 2 1 2 2 2 1 1 1 2 1 2
before Recycle before Flowing Contour the Line after Flow finished