C3121113331313231323132333131313231323131323223313233313232212111   >>    C312111333131323132313233313131323132313132322331323331323221211   <<    C3121113331313231323132333131313231323131323223313233313232212113   >>      C3121113331313231323132333131313231323131323223313233313232212112   >>