C1212121231123232233131323223313233313231323222313231323133323221   >>    C121212123112323223313132322331323331323132322231323132313332322   <<    C1212121231123232233131323223313233313231323222313231323133323223   >>      C1212121231123232233131323223313233313231323222313231323133323222   >>