 Complete the following phrase:  Claude Lutz is a French retired slalom canoeist who competed in the mid-to-late 1960s. With his wife Jarka Lutz née Jaroslava Krčálová, he won two silver medals at the 1969 ICF Canoe Slalom World Championships in Bourg St.-Maurice mixed C-2 event and mixed C-2 team event. He also won a bronze medal at the 