nnn nno nnp nns nnz no- non noo nop nos noy noz npn npo npp nps npz nsn nso nsp nss nsy nsz nyn nyo nyp nys nyy nzo nzp nzs nzz on- onn ono onp ons ony oo- oon ooo oop oos op- opn opo opp ops opy os- osn oso osp oss oyo oys ozo ozs ozz p-p pn- pnn pno pnp pns pny pon poo pop pos poy poz ppn ppo ppp pps ppz ps- psn pso psp pss psy py- pyn pyo pys pzp snn sno snp sns sny son soo sop sos soy soz spn spo spp sps spy spz ss- ssn sso ssp sss ssz sy- syn syp sys szp ynn ynp yns yny yon yoo yop yos yoy ypo yps yso ysp yss ysy ysz yys yyy yyz yzy znn zno znp zns zo- zon zoo zos zpo zpp zsz zzs zzy zzz