Embodiments are presented for executing an online game. An RF choke circuit is coupled to the second node and to a third node disposed between the first node and the RF circuit. The duct casing has a cavity defined in the duct casing, an air inlet communicating with the cavity and an air outlet communicating with the cavity. An aggregate, including soil or the like, can then be placed behind the face section and over the floor section of the wire facing unit and over the geogrid to form a geogrid-reinforced retaining wall section. The claw has a portion protruding inwardly from the base in a pressing direction, wherein the claw has an end which forms with the inwardly protruding section an obtuse angle.