 Complete the following phrase:  Adaptive rowing was taking place in France by 1971, with two classes of rowers initially participating: people with visual disabilities and people recovering from polio. People recovering from polio in France used boats with pontoons in order to increase their stability. Other changes were made to the boat with the development of a hinge-system to prevent rowers from tiring as easily. Blind rowers used the same boats during the 1970s and 1980s as their able-bodied counterparts but were guided on the course by a referee. Blind rowers were also encouraged to be in boats with sighted rowers, with the blind rowers serving as the stroke and the cox paying special attention to help the blinder rower. Classification was not something developed in France in this era as there was a focus on integrating rowers into the regular rowing community. In 1976, the total number of amputee classes was reduced to twelve ahead of the 