The predetermined parameters may be selected by {HEAD ~ a user}, advantageously from a predefined list of {TAIL ~ generic expressions} 
The predetermined parameters may be selected by { HEAD ~ a user } , advantageously from a predefined list of { TAIL ~ generic expressions }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL