a-a a-c a-t aaa aac aae aao aap aas aat ac- aca acc ace aco acp acs act aea aec aee aeo aep aes aet aoa aoc aoe aoo aop aos aot ap- apa apc ape apo app aps apt as- asa asc ase aso asp ass ast at- ata atc ate ato atp ats att c-- caa cac cae cao cap cas cat cca ccc cce cco ccp ccs cct ce- cea cec cee ceo cep ces cet co- coa coc coe coo cop cos cot cpa cpc cpe cpo cpp cps cpt csa csc cse cso csp css cst cta ctc cte cto ctp cts ctt eaa eac eae eao eap eas eat ec- eca ecc ece eco ecs ect eea eec eee eeo eep ees eet eo- eoa eoc eoe eoo eop eos eot ep- epa epc epe epo epp eps ept es- esa esc ese eso esp ess est eta etc ete eto etp ets ett oaa oac oae oao oap oas oat oc- oca occ oco ocp ocs oct oea oec oee oeo oep oes oet oo- ooa ooc ooo oop oos oot op- opa opc ope opo opp ops opt os- osa osc ose oso osp oss ost ot- ota otc ote oto otp ots ott p-p paa pac pae pao pap pas pat pca pcc pce pco pcp pcs pct pea pec pee peo pep pes pet poa poc poe poo pop pos pot ppa ppc ppe ppo ppp pps ppt ps- psa psc pse pso psp pss pst pt- pta ptc pte pto ptp pts ptt saa sac sae sao sap sas sat sca scc sce sco scp scs sct se- sea sec see seo sep ses set soa soc soe soo sop sos sot spa spc spe spo spp sps spt ss- ssa ssc sse sso ssp sss sst sta stc ste sto stp sts stt taa tac tae tao tap tas tat tca tcc tce tco tcp tcs tct te- tea tec tee teo tep tes tet to- toa toc toe too top tos tot tpa tpc tpe tpo tpp tps tpt tsa tsc tse tso tsp tss tst tta ttc tte tto ttp tts ttt