nnn nno nnp nns no- non noo nop nos nox noy npn npo npp nps nsn nso nsp nss nsx nsy nyn nyo nyp nys nyx nyy on- onn ono onp ons onx ony oo- oon ooo oop oos oox op- opn opo opp ops opx opy os- osn oso osp oss osx ox- oxn oxo oxx oxy oyo oys p-p pn- pnn pno pnp pns pnx pny pon poo pop pos pox poy ppn ppo ppp pps ppx ps- psn pso psp pss psx psy pxs py- pyn pyo pys pyx snn sno snp sns sny son soo sop sos sox soy spn spo spp sps spx spy ss- ssn sso ssp sss ssx sxn sxs sy- syn syp sys syx xno xns xon xoo xop xos xox xpn xpo xpp xps xsp xss xxo xxp xxx xxy xyp xyy ynn ynp yns yny yon yoo yop yos yox yoy ypo yps yso ysp yss ysy yxy yys yyy