{HEAD ~ A second building block} is added to {TAIL ~ the vessel} under conditions that allow the coupling of the first and second building blocks, and the rotor is spun at a speed sufficient to expel the liquid from the vessel 
is added to
{ HEAD ~ A second building block } is added to { TAIL ~ the vessel } under conditions that allow the coupling of the first and second building blocks , and the rotor is spun at a speed sufficient to expel the liquid from the vessel
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH