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