a-a a-c a-t aaa aac aao aap aat ac- aca acc aco acp act aoa aoc aoo aop aot ap- apa apc apo app apt at- ata atc ato atp att c-- caa cac cao cap cat cca ccc cco ccp cct co- coa coc coo cop cot cpa cpc cpo cpp cpt cta ctc cto ctp ctt oaa oac oao oap oat oc- oca occ oco ocp oct oo- ooa ooc ooo oop oot op- opa opc opo opp opt ot- ota otc oto otp ott p-p paa pac pao pap pat pca pcc pco pcp pct poa poc poo pop pot ppa ppc ppo ppp ppt pt- pta ptc pto ptp ptt taa tac tao tap tat tca tcc tco tcp tct to- toa toc too top tot tpa tpc tpo tpp tpt tta ttc tto ttp ttt