C1212121231123232233131323223313231333132333132322331323132313232212321   >>    C121212123112323223313132322331323133313233313232233132313231323221232   <<    C1212121231123232233131323223313231333132333132322331323132313232212323   >>      C1212121231123232233131323223313231333132333132322331323132313232212322   >>