| http://www.w3.org/ns/prov#value | - providing a card sized so that the card can be pushed through a magnetic card reader, the card including at least one hole positioned on the card and sized so that a magnetic head can partially protrude through the at least one hole as the card is being pushed through the magnetic card reader, wherein side edges of the at least one hole slidingly contact and clean the magnetic head; and pushing th
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