{HEAD ~ Cavities} are provided in {TAIL ~ the tub wall}; and water and air ducts are located in certain of such cavities 
{ HEAD ~ Cavities } are provided in { TAIL ~ the tub wall } ; and water and air ducts are located in certain of such cavities
HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH