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Paragraph Number

14

In one aspect, the first mesh and the second mesh may each have a first pattern and the upper mesh and the lower mesh may each have a second pattern. The first pattern and the second pattern may each be selected such that activation of the driver of the expansion mechanism causes a first predetermined increase in a distance between the upper plate and the lower plate that differs from a second predetermined increase in a distance between the first wall and the second wall.

Added by DJM 2 2021