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