A piston-in-sleeve accumulator includes a cleaning element positioned on the piston and configured to remove and prevent debris from lodging between the piston and a cylindrical nonpermeable sleeve within which the piston slides. In one example, icons in a link-analysis display that represent data objects satisfying a selection criterion are made to execute distinctive motion. Distinct play markers, which represent a respective player’s candidate to be moved along the play path spaces. The attachment structures include surfaces that engagingly mate with mounting structures on the leveler. In response to the request, the first party re-directs the first transaction at least in part from the third party to the first party.