The right arm rest slants downward like the arm of an easy chair to make the arm rest more comfortable for {HEAD ~ a user} sitting in {TAIL ~ the tub} whose arm would be more comfortable slanted downward from the elbow rather than slanted upward 
sitting in
The right arm rest slants downward like the arm of an easy chair to make the arm rest more comfortable for { HEAD ~ a user } sitting in { TAIL ~ the tub } whose arm would be more comfortable slanted downward from the elbow rather than slanted upward
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 REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH