Each molecular moiety may be different from every other molecular moiety within the array, such that the array is {HEAD ~ a “combinatorial” library} of {TAIL ~ the different molecular moieties} 
of
Each molecular moiety may be different from every other molecular moiety within the array , such that the array is { HEAD ~ a “ combinatorial ” library } of { TAIL ~ the different molecular moieties }
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 HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL