C1212121231123232233131323223313233313233313223313231323211232323221   >>    C121212123112323223313132322331323331323331322331323132321123232322   <<    C1212121231123232233131323223313233313233313223313231323211232323223   >>      C1212121231123232233131323223313233313233313223313231323211232323222   >>