For example, the processing unit 104 can search the feature index to determine whether {HEAD ~ the item} is contained in {TAIL ~ the sensor data} 
For example , the processing unit 104 can search the feature index to determine whether { HEAD ~ the item } is contained in { TAIL ~ the sensor data }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL