nnn nno nnp nns no- non noo nop nos noy npn npo npp nps nsn nso nsp nss nsy nyn nyo nyp nys nyy on- onn ono onp ons ony oo- oon ooo oop oos op- opn opo opp ops opy os- osn oso osp oss oyo oys p-p pn- pnn pno pnp pns pny pon poo pop pos poy ppn ppo ppp pps ps- psn pso psp pss psy py- pyn pyo pys snn sno snp sns sny son soo sop sos soy spn spo spp sps spy ss- ssn sso ssp sss sy- syn syp sys ynn ynp yns yny yon yoo yop yos yoy ypo yps yso ysp yss ysy yys yyy