In a connector comprised of a plug and a receptacle, displacement of the plug against the receptacle is lessened so that the plug is prevented to contact with a non corresponding post among the posts of the receptacle, and aligning portions of the plug and the receptacle are prevented from damage even when a force is applied obliquely when the plug is pulled out from the receptacle. Each clip has a main body having a structural member for securing to the rail, and having a pair of flanges symmetrical about a central axis. The composition engine generates the print job and transmits the print job and the set of data to a printing device of the print shop as page description language. The register file has a first section of n registers and a second section of m registers.