Сайт Роскомнадзора атаковали18:00
float value = fmodf(0.7548776662f * (float)x + 0.56984029f * (float)y, 1.0f);
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（一）非法收集、存储、使用、加工、传输、提供、公开、删除个人信息或者数据的；
The “Knocking on Wood” Wikipedia page mentions Roud’s conclusion, and this claim of a 19th century origin has circulated online as the final say on the matter. If you go back to the original, though, Roud’s proposal actually ends on an ambivalent note: “Before this theory [of 19th century origins] can be finally accepted, however, an examination of the history of European forms of this custom would be advisable.”