Disclosed are {HEAD ~ methods} and {TAIL ~ systems} for enabling analysis of communication content while preserving confidentiality 
Disclosed are { HEAD ~ methods } and { TAIL ~ systems } for enabling analysis of communication content while preserving confidentiality
OTH OTH HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH