C1212121231123232233131323223313231333132333132322331323132313232212121   >>    C121212123112323223313132322331323133313233313232233132313231323221212   <<    C1212121231123232233131323223313231333132333132322331323132313232212123   >>      C1212121231123232233131323223313231333132333132322331323132313232212122   >>