One or more techniques andor systems are disclosed for predicting propagation of a message on a social network. The blossoms are borne singly and in loose clusters. The goods so produced exhibit durable soil, oil, and water repellency. In particular, since vibration and noise generated upon shifting are decreased, the continuously variable transmission can be widely applied, from a small power device such as a bicycle or a motorcycle to a large power transmission apparatus such as an industrial machine. The ventilation openings communicate via communication pipes 30a to 30c to circulate air, and an air blowing section 34 circulates air in the tunnel section by drawing air from one of the upper or lower ventilation openings, into the pipes, and discharges the air from the other opening.