a-a a-c a-t aaa aac aae aak aao aap aas aat ac- aca acc ace ack aco acp acs act aea aec aee aek aeo aep aes aet aka akc ake akk ako akp aks aoa aoc aoe aok aoo aop aos aot ap- apa apc ape apk apo app aps apt as- asa asc ase ask aso asp ass ast at- ata atc ate ato atp ats att c-- caa cac cae cak cao cap cas cat cca ccc cce cck cco ccp ccs cct ce- cea cec cee cek ceo cep ces cet cka ckc cko cks ckt co- coa coc coe cok coo cop cos cot cpa cpc cpe cpk cpo cpp cps cpt csa csc cse csk cso csp css cst cta ctc cte ctk cto ctp cts ctt eaa eac eae eak eao eap eas eat ec- eca ecc ece eck eco ecs ect eea eec eee eek eeo eep ees eet eka ekc eke eko ekp eks ekt eo- eoa eoc eoe eok eoo eop eos eot ep- epa epc epe epo epp eps ept es- esa esc ese esk eso esp ess est eta etc ete etk eto etp ets ett k-t ka- kaa kac kae kak kao kap kas kat kca kcc kce kck kcp kcs kct ke- kea kec kee kek keo kep kes ket kkc kke kkk kkp kks kkt koa koc koe kok koo kop kos kot kpa kpc kpe kpk kpo kpp kps kpt ksa ksc kse ksk kso ksp kss kst kta ktc kte ktk kto ktp kts ktt oaa oac oae oak oao oap oas oat oc- oca occ ock oco ocp ocs oct oea oec oee oeo oep oes oet oka okc oke okk oko okp oks oo- ooa ooc ook ooo oop oos oot op- opa opc ope opk opo opp ops opt os- osa osc ose osk oso osp oss ost ot- ota otc ote otk oto otp ots ott p-p paa pac pae pak pao pap pas pat pca pcc pce pck pco pcp pcs pct pea pec pee pek peo pep pes pet pka pkc pke pko pkp pks pkt poa poc poe pok poo pop pos pot ppa ppc ppe ppk ppo ppp pps ppt ps- psa psc pse psk pso psp pss pst pt- pta ptc pte ptk pto ptp pts ptt saa sac sae sak sao sap sas sat sca scc sce sck sco scp scs sct se- sea sec see sek seo sep ses set sk- ska skc ske skk sko skp sks skt soa soc soe sok soo sop sos sot spa spc spe spk spo spp sps spt ss- ssa ssc sse ssk sso ssp sss sst sta stc ste stk sto stp sts stt taa tac tae tak tao tap tas tat tca tcc tce tck tco tcp tcs tct te- tea tec tee tek teo tep tes tet tka tkc tke tkk tko tkp tks tkt to- toa toc toe tok too top tos tot tpa tpc tpe tpk tpo tpp tps tpt tsa tsc tse tsk tso tsp tss tst tta ttc tte ttk tto ttp tts ttt