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