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Vertical or deeply inclined part of stairs between two sucessive steps
Also known as riser
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8 identifiers linking stair riser across the web's reference databases
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Stairs are a structure designed to bridge a large vertical distance between lower and higher levels by dividing it into smaller vertical distances. This is achieved as a diagonal series of horizontal platforms called steps which enable passage to the other level by stepping from one to another step in turn. Steps are very typically rectangular, but may instead be straight, curved, or may consist of two or more straight pieces connected at angles.