a-a a-c a-t aaa aac aae aaf aak aao aap aas aat ac- aca acc ace acf ack aco acp acs act aea aec aee aef aek aeo aep aes aet af- afa afc afe aff afk afo afp afs aft aka akc ake akk ako akp aks aoa aoc aoe aof aok aoo aop aos aot ap- apa apc ape apf apk apo app aps apt as- asa asc ase asf ask aso asp ass ast at- ata atc ate atf ato atp ats att c-- caa cac cae caf cak cao cap cas cat cca ccc cce ccf cck cco ccp ccs cct ce- cea cec cee cef cek ceo cep ces cet cfa cfc cfe cff cfk cfo cfp cfs cft cka ckc cko cks ckt co- coa coc coe cof cok coo cop cos cot cpa cpc cpe cpf cpk cpo cpp cps cpt csa csc cse csf csk cso csp css cst cta ctc cte ctf ctk cto ctp cts ctt eaa eac eae eaf eak eao eap eas eat ec- eca ecc ece ecf eck eco ecs ect eea eec eee eef eek eeo eep ees eet ef- efa efc efe eff efo efp efs eft eka ekc eke ekf eko ekp eks ekt eo- eoa eoc eoe eof eok eoo eop eos eot ep- epa epc epe epf epo epp eps ept es- esa esc ese esf esk eso esp ess est eta etc ete etf etk eto etp ets ett faa fac fae faf fak fao fap fas fat fca fcc fce fcf fck fco fcp fcs fct fea fec fee fef fek feo fep fes fet ffa ffc ffe fff ffk ffo ffp ffs fft fka fkc fkf fkk fkp fkt foa foc foe fof fok foo fop fos fot fpa fpc fpe fpk fpo fpp fps fpt fsa fsc fse fsf fsk fso fsp fss fst fta ftc fte ftf ftk fto ftp fts ftt k-t ka- kaa kac kae kaf kak kao kap kas kat kca kcc kce kck kcp kcs kct ke- kea kec kee kef kek keo kep kes ket kfa kfc kff kfo kfs kkc kke kkk kkp kks kkt koa koc koe kof kok koo kop kos kot kpa kpc kpe kpf kpk kpo kpp kps kpt ksa ksc kse ksf ksk kso ksp kss kst kta ktc kte ktf ktk kto ktp kts ktt oaa oac oae oaf oak oao oap oas oat oc- oca occ ocf ock oco ocp ocs oct oea oec oee oef oeo oep oes oet of- ofa ofc ofe off ofo ofp ofs oft oka okc oke okk oko okp oks oo- ooa ooc oof ook ooo oop oos oot op- opa opc ope opf opk opo opp ops opt os- osa osc ose osf osk oso osp oss ost ot- ota otc ote otf otk oto otp ots ott p-p paa pac pae paf pak pao pap pas pat pca pcc pce pcf pck pco pcp pcs pct pea pec pee pef pek peo pep pes pet pfa pfc pfe pff pfk pfo pfp pfs pft pka pkc pke pkf pko pkp pks pkt poa poc poe pof pok poo pop pos pot ppa ppc ppe ppf ppk ppo ppp pps ppt ps- psa psc pse psf psk pso psp pss pst pt- pta ptc pte ptf ptk pto ptp pts ptt saa sac sae saf sak sao sap sas sat sca scc sce scf sck sco scp scs sct se- sea sec see sef sek seo sep ses set sfa sfc sfe sff sfk sfo sfp sfs sft sk- ska skc ske skf skk sko skp sks skt soa soc soe sof sok soo sop sos sot spa spc spe spf spk spo spp sps spt ss- ssa ssc sse ssf ssk sso ssp sss sst sta stc ste stf stk sto stp sts stt taa tac tae taf tak tao tap tas tat tca tcc tce tcf tck tco tcp tcs tct te- tea tec tee tef tek teo tep tes tet tfa tfc tfe tff tfk tfo tfp tfs tft tka tkc tke tkk tko tkp tks tkt to- toa toc toe tof tok too top tos tot tpa tpc tpe tpf tpk tpo tpp tps tpt tsa tsc tse tsf tsk tso tsp tss tst tta ttc tte ttf ttk tto ttp tts ttt