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