The Chamber of Commerce, Agriculture, and Industry at N'Djamena has branches at Sarh, Moundou, Bol, and Abéché. In rural areas, cooperatives promote the production and marketing of agricultural products. Fishermen and artisans also maintain cooperatives. Self-help tribal societies have grown rapidly, particularly in the larger towns, where members of ethnic groups act together to assist newcomers and to maintain links with those remaining in traditional areas. The Student Association of the University of Chad (AEUT) is one of the largest student organizations affiliated with the National Union of Chadian Students and Pupils (UGEST). Church youth organizations are active, as are chapters of various scouting organizations.