{TAIL ~ The wheelchair} also has improved stability since {HEAD ~ the front ground engaging wheel} also acts as a resiliently biased anti tip wheel 
{ TAIL ~ The wheelchair } also has improved stability since { HEAD ~ the front ground engaging wheel } also acts as a resiliently biased anti tip wheel
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH