A filter comprising a body, an inlet for a liquid passing into the body, an outlet for the liquid passing out of the body, and a foam material in the body for filtering the liquid as the liquid passes through the body and also for absorbing water in the liquid. Transmission side transmits processed data, second signed data obtained by applying one-way function to merged data of the processed data and first signed data of an original image and ciphering the output of the one-way function with transmission side secret key, and ciphered signed data obtained by ciphering the first signed data with reception side public key. Graphical display of hierarchical hardlinks to files in a file system also includes providing a list of hardlinks to the file and providing in the file a pointer to the list. Since the internal plumbing of the fuel injector is connected to a high pressure rail during and between injection events, static leakage across the guide region of the needle valve member can reduce efficiency. The first and second electrodes are electrically connected to first and second surfaces of the PTC material layer through the first and second connecting conductors, respectively. The device may accommodate and buffer movement of the spinal cord both laterally and in a caudal-rostral fashion so that the electrode array remains in place.