Event data reflective of {HEAD ~ other types} of {TAIL ~ user actions}, such as item detail page viewing events, browse node visits, search query submissions, and web browsing patterns may additionally or alternatively be considered 
of
Event data reflective of { HEAD ~ other types } of { TAIL ~ user actions } , such as item detail page viewing events , browse node visits , search query submissions , and web browsing patterns may additionally or alternatively be considered
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL 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