The invention concerns a closure for a cylindrical can The closure includes a flexible member of the easy-open type secured across the open end of the can. The side frames support slides on which members slide for the mounting of the tool-carrier cassettes. Each of the segmented electrodes extends around no more than 75% of a circumference of the lead and is disposed in a different one of the segmented electrode receiving openings of the electrode carrier. The total number of spam reports and not spam reports for may then be used with a sender categorization model to rapidly predict whether the sender is likely to be a spammer. If the information relates to a new company, the system builds a new company profile based upon the information. The method involves feeding paper through a printing apparatus, outputting a sensing signal for the paper using a sensor disposed adjacent to a print head, and calculating a gradient of the sensing signal and detecting an edge of the paper based on the gradient of the sensing signal.