nnn nno nnp nns nnt no- non noo nop nos not npn npo npp nps npt nsn nso nsp nss nst ntn nto ntp nts ntt on- onn ono onp ons ont oo- oon ooo oop oos oot op- opn opo opp ops opt os- osn oso osp oss ost ot- otn oto otp ots ott p-p pn- pnn pno pnp pns pnt pon poo pop pos pot ppn ppo ppp pps ppt ps- psn pso psp pss pst pt- ptn pto ptp pts ptt snn sno snp sns snt son soo sop sos sot spn spo spp sps spt ss- ssn sso ssp sss sst stn sto stp sts stt tnn tno tnp tns tnt to- ton too top tos tot tpn tpo tpp tps tpt tsn tso tsp tss tst ttn tto ttp tts ttt