A compound of formula :or a physiologically acceptable solvate thereof. The method comprises cleaning the said areas with dilute soap solution delivered by gravity drainage, or a soap solution-air suspension delivered from a dispenser, and rinsing the cleaned areas with water delivered by gravity drainage or from a water dispenser. A contact evaluation point calculating unit calculates, when it is determined that the predetermined contact condition is satisfied, a contact evaluation point of the contact evaluation target object, based on a state of at least one of the contact evaluation target object and the contacting candidate object in the virtual three dimensional space. The received signal may be down-converted to a complex baseband by conditioning circuitry. Then, when a user requests one of the documents, the document will already have been retrieved from storage. The score lines define a first planar portion and a second planar portion, and enable the first planar portion to be folded over onto the second planar portion to thereby form a flat cavity between the first planar portion and the second planar portion.