There is disclosed an electrooptical device capable of achieving a large area display by making full use of the size of the substrate. Thereby, the charging time t1 depends on the characteristics of the circuit elements, which are provided in the package of a semiconductor device 70 and therefore subject to manufacturing variations of the semiconductor device 70. A kit of preforms containing multiple bins of various geometrical shapes and sizes are available to repair mainly molars and premolars in the upper and lower arches. Another embodiment is a storage device comprising a first electrode a state change element in contact with the first electrode, the state change comprises at least one of cerium oxide or bismuth oxide, and a second electrode in contact with the state change element. The determined clock skew is based on the first delay value for a first node, the second delay value for a second node, and the common delay value for the shared portion of the paths from the clock source to the first and second nodes.