{HEAD ~ An aliquot} of {TAIL ~ the sample solution} containing the liberated nucleic acids in the lysis, permeabilization or transport medium is added to the second solution, and mixed vigorously 
{ HEAD ~ An aliquot } of { TAIL ~ the sample solution } containing the liberated nucleic acids in the lysis , permeabilization or transport medium is added to the second solution , and mixed vigorously
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL 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