That is, as described previously, the diazotizing reagent and the coupling reagent together with a necessary amount of an acid must be placed in {HEAD ~ the pores} of {TAIL ~ the porous body} 
of
That is , as described previously , the diazotizing reagent and the coupling reagent together with a necessary amount of an acid must be placed in { HEAD ~ the pores } of { TAIL ~ the porous body }
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 HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL