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