a-a a-c a-t aaa aac aae aaf aao aap aat ac- aca acc ace acf aco acp act aea aec aee aef aeo aep aet af- afa afc afe aff afo afp aft aoa aoc aoe aof aoo aop aot ap- apa apc ape apf apo app apt at- ata atc ate atf ato atp att c-- caa cac cae caf cao cap cat cca ccc cce ccf cco ccp cct ce- cea cec cee cef ceo cep cet cfa cfc cfe cff cfo cfp cft co- coa coc coe cof coo cop cot cpa cpc cpe cpf cpo cpp cpt cta ctc cte ctf cto ctp ctt eaa eac eae eaf eao eap eat ec- eca ecc ece ecf eco ect eea eec eee eef eeo eep eet ef- efa efc efe eff efo efp eft eo- eoa eoc eoe eof eoo eop eot ep- epa epc epe epf epo epp ept eta etc ete etf eto etp ett faa fac fae faf fao fap fat fca fcc fce fcf fco fcp fct fea fec fee fef feo fep fet ffa ffc ffe fff ffo ffp fft foa foc foe fof foo fop fot fpa fpc fpe fpo fpp fpt fta ftc fte ftf fto ftp ftt oaa oac oae oaf oao oap oat oc- oca occ ocf oco ocp oct oea oec oee oef oeo oep oet of- ofa ofc ofe off ofo ofp oft oo- ooa ooc oof ooo oop oot op- opa opc ope opf opo opp opt ot- ota otc ote otf oto otp ott p-p paa pac pae paf pao pap pat pca pcc pce pcf pco pcp pct pea pec pee pef peo pep pet pfa pfc pfe pff pfo pfp pft poa poc poe pof poo pop pot ppa ppc ppe ppf ppo ppp ppt pt- pta ptc pte ptf pto ptp ptt taa tac tae taf tao tap tat tca tcc tce tcf tco tcp tct te- tea tec tee tef teo tep tet tfa tfc tfe tff tfo tfp tft to- toa toc toe tof too top tot tpa tpc tpe tpf tpo tpp tpt tta ttc tte ttf tto ttp ttt