sentences:  Desgrange withdrew ACP's permission to organise events under his Audax regulations, and ACP created its own allure libre (free-paced) version of the sport, where successful riders were awarded certificates called Brevets des Randonneurs.Desgrange continued to promote the original Audax rules, and on July 14, 1921 the Union of Parisian Audax Cyclistes (UACP) was formed, which became the Union of French Audax in January 1956.Participants in the original form of audax ride in a group, at a steady pace set by a road captain.