a-a a-c a-t a-z aaa aac aao aap aat aaz ac- aca acc aco acp act acz aoa aoc aoo aop aot ap- apa apc apo app apt at- ata atc ato atp att atz az- aza azo azp azt azz c-- caa cac cao cap cat caz cca ccc cco ccp cct ccz co- coa coc coo cop cot coz cpa cpc cpo cpp cpt cpz cta ctc cto ctp ctt ctz cz- czc czo czt oaa oac oao oap oat oc- oca occ oco ocp oct ocz oo- ooa ooc ooo oop oot op- opa opc opo opp opt ot- ota otc oto otp ott otz oza ozo ozt ozz p-p paa pac pao pap pat paz pca pcc pco pcp pct poa poc poo pop pot poz ppa ppc ppo ppp ppt ppz pt- pta ptc pto ptp ptt ptz pzc pzp pzt taa tac tao tap tat taz tca tcc tco tcp tct to- toa toc too top tot toz tpa tpc tpo tpp tpt tpz tta ttc tto ttp ttt tza zaa zac zao zap zat zaz zco zo- zoa zoc zoo zot zpc zpo zpp zpt zta zzt zzz