 Complete the following phrase:  After these successes Lipkin began the transition to the longer distance C-1 500m in preparation for the 2008 Summer Olympics, where there will be no 200 m races. He didnt appear at the 2006 European Senior Championships; instead he was entered for the under-23 championships in Schinias, Greece, where he won two titles, the C-1 500m and also the C-2 500m with Ilya Shtokalov. At the senior world championships in Szeged. Hungary. however he returned to the 200 m distance and became individual C-1 champion ahead of Ukraines Valentin Demyanenko. Lipkin won a silver in the C-4 200 m event at the 2007 championships in Duisburg. He also won five medals at the 