a-a a-c a-t a-z aaa aac aae aao aap aat aaz ac- aca acc ace aco acp act acz aea aec aee aeo aep aet aez aoa aoc aoe aoo aop aot ap- apa apc ape apo app apt at- ata atc ate ato atp att atz az- aza aze azo azp azt azz c-- caa cac cae cao cap cat caz cca ccc cce cco ccp cct ccz ce- cea cec cee ceo cep cet cez co- coa coc coe coo cop cot coz cpa cpc cpe cpo cpp cpt cpz cta ctc cte cto ctp ctt ctz cz- czc cze czo czt eaa eac eae eao eap eat eaz ec- eca ecc ece eco ect eea eec eee eeo eep eet eo- eoa eoc eoe eoo eop eot ep- epa epc epe epo epp ept epz eta etc ete eto etp ett etz eze ezo ezz oaa oac oae oao oap oat oc- oca occ oco ocp oct ocz oea oec oee oeo oep oet oo- ooa ooc ooo oop oot op- opa opc ope opo opp opt ot- ota otc ote oto otp ott otz oza oze ozo ozt ozz p-p paa pac pae pao pap pat paz pca pcc pce pco pcp pct pea pec pee peo pep pet pez poa poc poe poo pop pot poz ppa ppc ppe ppo ppp ppt ppz pt- pta ptc pte pto ptp ptt ptz pzc pzp pzt taa tac tae tao tap tat taz tca tcc tce tco tcp tct te- tea tec tee teo tep tet tez to- toa toc toe too top tot toz tpa tpc tpe tpo tpp tpt tpz tta ttc tte tto ttp ttt tza tze zaa zac zao zap zat zaz zce zco zea zec zee zeo zep zet zez zo- zoa zoc zoe zoo zot zpc zpe zpo zpp zpt zta zte zzt zzz