{TAIL ~ The profiles} adjust against each other under the specific angle of 26.565 and thereby, used in series, create {HEAD ~ 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 
{ TAIL ~ The profiles } adjust against each other under the specific angle of 26.565 and thereby , used in series , create { HEAD ~ 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
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