C1212121231123232233131323223313231333132322133313132313231322221   >>    C121212123112323223313132322331323133313232213331313231323132222   <<    C1212121231123232233131323223313231333132322133313132313231322223   >>      C1212121231123232233131323223313231333132322133313132313231322222   >>