An optical disk 101 includes a plurality of recording layers 102 and 103 and allows recording of information on each of the recording layers 102 and 103. The reconfiguration is achieved by modifying a limited number of selectively removable components of the support assembly or the pivot assembly of the wheelchair. In response to receiving an indication from the TCP server that it has not received a cached TCP packet, the second gateway may resend the packet without relaying the indication to the TCP client, and the first gateway may send a control message instead of a complete TCP packet to the second gateway. The ground dowel insert part is fixed on the removed beam in accordance with the position determined by the retaining means, and the beam thus positioned, with the ground dowel insert part fixed thereon, is inserted into the retaining section of the ground dowel. The uneven shape corresponds to the unevenness sense of the first image and unevenness sense of fabric where the first image is supposed to be formed.