a-a a-c a-t aaa aac aao aap aat aay ac- aca acc aco acp act acy aoa aoc aoo aop aot ap- apa apc apo app apt apy at- ata atc ato atp att ay- aya ayc ayo ayp ayt c-- caa cac cao cap cat cay cca ccc cco ccp cct co- coa coc coo cop cot coy cpa cpc cpo cpp cpt cta ctc cto ctp ctt cty cya cyc cyo cyp cyt oaa oac oao oap oat oc- oca occ oco ocp oct oo- ooa ooc ooo oop oot op- opa opc opo opp opt opy ot- ota otc oto otp ott oya oyo p-p paa pac pao pap pat pay pca pcc pco pcp pct poa poc poo pop pot poy ppa ppc ppo ppp ppt pt- pta ptc pto ptp ptt pty py- pya pyc pyo pyt taa tac tao tap tat tay tca tcc tco tcp tct to- toa toc too top tot toy tpa tpc tpo tpp tpt tta ttc tto ttp ttt tty tya tyc tyo typ tyt yaa yac yao yap yat yay yca ycc yco ycp ycy yoc yoo yop yot yoy ypa ypo yta ytc yto ytp ytt yyc yyt yyy