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AI sound source vocal unit formed by 9 freight drivers At one point, the number of people decreased to three, but now it has returned to six. At the moment, the only person who can show his face is Kiyohiro Kosugi, but we plan to gradually get him used to it. cos9n is a unit name taken from Kiyohiro Kosugi's nickname. There is also a nickname for the meaning. This is because the graph of cos(9n) in the trigonometric equation resembles a vibrato. It was named cos9n considering its relationship with music. When we have more than 9 people, aiming for a unit of 90,000 freight drivers.