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