a-a a-c a-t aaa aac aan aao aap aas aat ac- aca acc acn aco acp acs act an- ana anc ann ano anp ans ant aoa aoc aon aoo aop aos aot ap- apa apc apn apo app aps apt as- asa asc asn aso asp ass ast at- ata atc atn ato atp ats att c-- caa cac can cao cap cas cat cca ccc ccn cco ccp ccs cct cn- cna cnc cnn cno cnp cns cnt co- coa coc con coo cop cos cot cpa cpc cpn cpo cpp cps cpt csa csc csn cso csp css cst cta ctc ctn cto ctp cts ctt naa nac nan nao nap nas nat nca ncc ncn nco ncp ncs nct nna nnc nnn nno nnp nns nnt no- noa noc non noo nop nos not npa npc npn npo npp nps npt nsa nsc nsn nso nsp nss nst nta ntc ntn nto ntp nts ntt oaa oac oan oao oap oas oat oc- oca occ ocn oco ocp ocs oct on- ona onc onn ono onp ons ont oo- ooa ooc oon ooo oop oos oot op- opa opc opn opo opp ops opt os- osa osc osn oso osp oss ost ot- ota otc otn oto otp ots ott p-p paa pac pan pao pap pas pat pca pcc pcn pco pcp pcs pct pn- pna pnc pnn pno pnp pns pnt poa poc pon poo pop pos pot ppa ppc ppn ppo ppp pps ppt ps- psa psc psn pso psp pss pst pt- pta ptc ptn pto ptp pts ptt saa sac san sao sap sas sat sca scc scn sco scp scs sct sna snc snn sno snp sns snt soa soc son soo sop sos sot spa spc spn spo spp sps spt ss- ssa ssc ssn sso ssp sss sst sta stc stn sto stp sts stt taa tac tan tao tap tas tat tca tcc tcn tco tcp tcs tct tna tnc tnn tno tnp tns tnt to- toa toc ton too top tos tot tpa tpc tpn tpo tpp tps tpt tsa tsc tsn tso tsp tss tst tta ttc ttn tto ttp tts ttt