In practice, {HEAD ~ the system} will advantageously include {TAIL ~ two or more such matched sets} of identification elements, each set bearing a unique identification symbol 
advantageously include
In practice , { HEAD ~ the system } will advantageously include { TAIL ~ two or more such matched sets } of identification elements , each set bearing a unique identification symbol
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH