A sheet switch module includes a circuit board provided with a fixed contact thereon, a light source, a movable contact to face the fixed contact, a sheet to hold the movable contact on the circuit board, a key top disposed to face the movable contact and a light guiding plate to guide light emitted from the light source to the key top. In accordance with the system and method of the invention, a communication control system is provided that includes a server side and a client side. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PHHEB through backcross conversion andor transformation, and to the maize seed, plant and plant part produced thereby. Participants are queried, and enter wagers via the user input interface. To this end, the invention provides that the at least two boreholes are connected to a connection block, the throttles are accommodated inside this connection block, and the check valve is assigned to said connection block.