When the actions are recorded as a function of {HEAD ~ time}, i.e. when they include information relating to the time and date of execution, the recorded information can be used as a valuable source of {TAIL ~ statistical information} 
When the actions are recorded as a function of { HEAD ~ time } , i.e. when they include information relating to the time and date of execution , the recorded information can be used as a valuable source of { TAIL ~ statistical information }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD 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 TAIL TAIL TAIL TAIL TAIL TAIL