On the other hand, if the back leg supporting surface 126 is at a lower elevation than the ladder element supporting surface 128, as illustrated in FIG 4, {HEAD ~ the length} of the back leg assembly 26 can be extended to maintain {TAIL ~ the ladder angle} 38 within the useable range 
On the other hand , if the back leg supporting surface 126 is at a lower elevation than the ladder element supporting surface 128 , as illustrated in FIG 4 , { HEAD ~ the length } of the back leg assembly 26 can be extended to maintain { TAIL ~ the ladder angle } 38 within the useable range
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 OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH