{TAIL ~ A polymer} based on a dicarboxylic acid and a diamine is prepared by polycondensation in {HEAD ~ an extruder}, by 
{ TAIL ~ A polymer } based on a dicarboxylic acid and a diamine is prepared by polycondensation in { HEAD ~ an extruder } , by
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH