In particular, system 301 may provide several grouping operators that analyze and consolidate {TAIL ~ data} from {HEAD ~ multiple streams} 
In particular , system 301 may provide several grouping operators that analyze and consolidate { TAIL ~ data } from { HEAD ~ multiple streams }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD