The first fabric may be {HEAD ~ a permeable fabric}, which is positioned downstream from {TAIL ~ the dryer} 
is positioned downstream from
The first fabric may be { HEAD ~ a permeable fabric } , which is positioned downstream from { TAIL ~ the dryer }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL