C1212121231123232233131323223313233313233313223313231331123123221   >>    C121212123112323223313132322331323331323331322331323133112312322   <<    C1212121231123232233131323223313233313233313223313231331123123223   >>      C1212121231123232233131323223313233313233313223313231331123123222   >>