Articles of footwear, including athletic footwear, include cleat structures, strapping systems, sole structures, andor improved natural motion characteristics are described. It has central retractable strap for securing an object to trolley and loops at respective ends to enable trolley to be manually pulled, carried up stairs, etc. Slots are formed in the feeder line for preventing formation of a stress-induced void at an interface between the feeder line and the via structure. Upper cables extend from the carriage to an upper end of the first track and the second track. Also disclosed are organic metal compounds in which the compounds for host and the compounds for dopant are connected to make energy transmission between host and dopant possible in a molecular level, organic electroluminescence display devices using the same and a preparation method thereof. The pseudonym for the security artifact is bound with a user account at the service provider for a user associated with the security artifact.