For example, in the context of an online store or {TAIL ~ marketplace}, the matching service may primarily or exclusively analyze {HEAD ~ user purchase data}, which tends to be a very strong indicator of the item preferences of users 
For example , in the context of an online store or { TAIL ~ marketplace } , the matching service may primarily or exclusively analyze { HEAD ~ user purchase data } , which tends to be a very strong indicator of the item preferences of users
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH