{TAIL ~ A second building block} is added to the vessel under conditions that allow {HEAD ~ 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 
{ TAIL ~ A second building block } is added to the vessel under conditions that allow { HEAD ~ 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
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH