C1212121231123232233131323223313233313233313223313231323131312312121   >>    C121212123112323223313132322331323331323331322331323132313131231212   <<    C1212121231123232233131323223313233313233313223313231323131312312123   >>      C1212121231123232233131323223313233313233313223313231323131312312122   >>