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, the length of the back leg assembly 26 can be extended to maintain {HEAD ~ the ladder angle} 38 within {TAIL ~ the useable range} 
within
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 , the length of the back leg assembly 26 can be extended to maintain { HEAD ~ the ladder angle } 38 within { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL