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