C1212121231123232233131323223313233313233313223313231313123123221   >>    C121212123112323223313132322331323331323331322331323131312312322   <<    C1212121231123232233131323223313233313233313223313231313123123223   >>      C1212121231123232233131323223313233313233313223313231313123123222   >>