{HEAD ~ Process} for producing a polyamide based on a dicarboxylic acid and {TAIL ~ a diamine} 
{ HEAD ~ Process } for producing a polyamide based on a dicarboxylic acid and { TAIL ~ a diamine }
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL