A method includes specifying a first set of interconnected devices associated with a first leaf cell in Verilog syntax, and specifying a second set of interconnected devices associated with a second leaf cell in Verilog syntax. The drive roll assembly has first and second drive rolls, an intervening transmission gear wheel, and a rotatable arm plate. The vibration unit vibrates when the distance between the pointer and the touch panel is not larger than a first distance and then reaches a second distance or more. The articulating force structure providing an articulating forward force to the fiber optic plug ferrule facilitates alignment of the ferrule with the optical receptacle to preserve optical performance. At least one wire-type shaping element cooperates with the interior ceiling in order to shape the interior ceiling.