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