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. \begin{displaydance} \phfour{b1n,g1s,g2n,b2s} & \phBB{g1s,b2n,b1s,g2n} & \phBB{b2n,g2n,g1s,b1s} & \pvfour{b1e,g2w,g1e,b2w} \cr \cbox{before Recycle} & \cbox{before Flowing\\Contour the Line} & \cbox{after Flow} & finished \\ \end{displaydance