In addition, the skirt valve typically lacks a spoke to hold the center of the valve in place, and therefore lacks the problems associated with {HEAD ~ the spokes} catching {TAIL ~ foreign objects} 
catching
In addition , the skirt valve typically lacks a spoke to hold the center of the valve in place , and therefore lacks the problems associated with { HEAD ~ the spokes } catching { TAIL ~ foreign objects }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL