Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula : . Each mobile phone may be provisioned with an event management program that receives information and data from the computer system, provides instructions and other information to an event personnel using the mobile phone, receives inputs from the event personnel while a product or service demonstration is being performed, and transmits information and data back to the computer system. A front side of the mounting panel is adapted for receiving and supporting the cooling units in a pattern defining a cantilevered, tubular polygonal solid disposed about the fan. Coolant holes are formed in the end mill main body and are opened on an extended line of the short edge toward the axis line from the inner peripheral end of the short edge in the tip of the end mill main body. The lookup engine performs a lookup for the header and returns a resultant.