{TAIL ~ The profiles} adjust against each other under the specific angle of 26.565 and thereby, used in series, create stairways of various rise and run relations, maintaing {HEAD ~ the same profile} at all times, satisfying requirements of all building codes and follow the measure of the human step on an incline 
{ TAIL ~ The profiles } adjust against each other under the specific angle of 26.565 and thereby , used in series , create stairways of various rise and run relations , maintaing { HEAD ~ the same profile } at all times , satisfying requirements of all building codes and follow the measure of the human step on an incline
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 OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH