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