{HEAD ~ The vacuum cleaner} 1, wherein {TAIL ~ the filter bag} is made of synthetic fibers 
wherein
{ HEAD ~ The vacuum cleaner } 1 , wherein { TAIL ~ the filter bag } is made of synthetic fibers
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH