A method provides a secondary game for controlling free plays awarded in a wagering game conducted through a gaming machine. Universal Plug and Play is used to advertise, find, and control the display devices. The premix includes marine-sourced docosahexaenoic acid and eicosapentaenoic acid and plant-sourced alpha-linolenic acid. The valve and the pump are actuated in a controlled manner to selectively give a supply mode for supplying the liquid to the basin from the tank and a recovery mode for recovering the liquid from the basin to the tank. The method reduces the amount of catalyst needed for a high performance fuel cell electrode to about 0. The digital copying machine has a link copy function that a document is set in the machine itself or another digital copying machine and at least two units of the digital copying machines share the job of executing copy operation on the document, and a printer function of printing according to a print request from the outside.