a-a a-c a-t aaa aac aap aat aay ac- aca acc acp act acy ap- apa apc app apt apy at- ata atc atp att ay- aya ayc ayp ayt c-- caa cac cap cat cay cca ccc ccp cct cpa cpc cpp cpt cta ctc ctp ctt cty cya cyc cyp cyt p-p paa pac pap pat pay pca pcc pcp pct ppa ppc ppp ppt pt- pta ptc ptp ptt pty py- pya pyc pyt taa tac tap tat tay tca tcc tcp tct tpa tpc tpp tpt tta ttc ttp ttt tty tya tyc typ tyt yaa yac yap yat yay yca ycc ycp ycy ypa yta ytc ytp ytt yyc yyt yyy