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