The process 1, wherein {HEAD ~ the mat} comprises {TAIL ~ synthetic felts}, synthetic fabrics, natural felts or natural fabrics 
comprises
The process 1 , wherein { HEAD ~ the mat } comprises { TAIL ~ synthetic felts } , synthetic fabrics , natural felts or natural fabrics
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH