C1212121231123232233131323223313233313233313223313233313121123221   >>    C121212123112323223313132322331323331323331322331323331312112322   <<    C1212121231123232233131323223313233313233313223313233313121123223   >>      C1212121231123232233131323223313233313233313223313233313121123222   >>