An allocation unit allocates a path formed by combining a link between nodes to any one of a plurality of time slots. Such link space information provides link-centric information with respect to wireless links of a network to thereby provide a view of the network which takes into account phenomena affecting the wireless links. The reduction catalyst comprises this polymer and a transition metal. , using the same communication hardware and software. The light emitting member generates a light beam to the keyboard. The first clock transistor has a second threshold voltage.