| 摘要 |
Six steps of varying height are provided adjacent to one another in an integrated unit resting upon and surrounded by a floor surface. The height of each step in relation to its adjacent steps, and in relation to the floor, is determined such that by stepping between any chosen pair of adjacent steps, or by stepping between the floor and any given single step, step height differentials of approximately 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, and optionally 26 inches are all made available to the user.
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