A video poker machine configured to allow a player to play a card game includes at least one display device, at least one input device, and at least one computer configured to display at least a first hand and a second hand of at least five cards all face up, each hand including the same five cards. During operation, the system encrypts a file with a key K at a file manager and then stores the encrypted file in non-volatile storage. Thus, the measurement of the slope is independent of and substantially unaffected by absolute values of the characteristics measured at the first and second predetermined times. At least each contact hole is formed in a non-aperture region at a position symmetrical with respect to two adjacent data lines. The resin moves downwardly in another chamber during mode.