For example, in {HEAD ~ the context} of an online store or {TAIL ~ 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 users 
For example , in { HEAD ~ the context } of an online store or { TAIL ~ 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 users
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