a-a a-t aaa aan aao aap aas aat an- ana ann ano anp ans ant aoa aon aoo aop aos aot ap- apa apn apo app aps apt as- asa asn aso asp ass ast at- ata atn ato atp ats att naa nan nao nap nas nat nna nnn nno nnp nns nnt no- noa non noo nop nos not npa npn npo npp nps npt nsa nsn nso nsp nss nst nta ntn nto ntp nts ntt oaa oan oao oap oas oat on- ona onn ono onp ons ont oo- ooa oon ooo oop oos oot op- opa opn opo opp ops opt os- osa osn oso osp oss ost ot- ota otn oto otp ots ott p-p paa pan pao pap pas pat pn- pna pnn pno pnp pns pnt poa pon poo pop pos pot ppa ppn ppo ppp pps ppt ps- psa psn pso psp pss pst pt- pta ptn pto ptp pts ptt saa san sao sap sas sat sna snn sno snp sns snt soa son soo sop sos sot spa spn spo spp sps spt ss- ssa ssn sso ssp sss sst sta stn sto stp sts stt taa tan tao tap tas tat tna tnn tno tnp tns tnt to- toa ton too top tos tot tpa tpn tpo tpp tps tpt tsa tsn tso tsp tss tst tta ttn tto ttp tts ttt