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Abstract

Systems for circulation a fluid through a system and substituent component systems of the same. In one example, a pressure input system includes a bladder support, an expelling element, and a roll-up bladder configured to spool about the expelling element. The bladder support can rotate about an axis of rotation between at least a first configuration and a second configuration. The bladder support can include a first end and a second end opposite the first end. A distance between the first end and a ground surface when the bladder support is in the first configuration can be greater than a distance between the second end and the ground surface and a distance between the first end and the ground surface when the bladder support is in the second configuration can be less than a distance between the second end and the ground surface.

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