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 the same profile at all times, satisfying requirements of all building codes and follow {HEAD ~ the measure} of {TAIL ~ the human step} on an incline 
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 the same profile at all times , satisfying requirements of all building codes and follow { HEAD ~ the measure } of { TAIL ~ the human step } on an incline
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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH