C3121113331313231323132333131313231323131323223313233313233313232233133331221   >>    C312111333131323132313233313131323132313132322331323331323331323223313333122   <<    C3121113331313231323132333131313231323131323223313233313233313232233133331223   >>      C3121113331313231323132333131313231323131323223313233313233313232233133331222   >>