a-a a-c a-t aaa aac aap aas aat aay ac- aca acc acp acs act acy ap- apa apc app aps apt apy as- asa asc asp ass ast asy at- ata atc atp ats att ay- aya ayc ayp ays ayt c-- caa cac cap cas cat cay cca ccc ccp ccs cct cpa cpc cpp cps cpt csa csc csp css cst csy cta ctc ctp cts ctt cty cya cyc cyp cys cyt p-p paa pac pap pas pat pay pca pcc pcp pcs pct ppa ppc ppp pps ppt ps- psa psc psp pss pst psy pt- pta ptc ptp pts ptt pty py- pya pyc pys pyt saa sac sap sas sat say sca scc scp scs sct spa spc spp sps spt spy ss- ssa ssc ssp sss sst sta stc stp sts stt sty sy- sya syc syp sys syt taa tac tap tas tat tay tca tcc tcp tcs tct tpa tpc tpp tps tpt tsa tsc tsp tss tst tsy tta ttc ttp tts ttt tty tya tyc typ tys tyt yaa yac yap yas yat yay yca ycc ycp ycs ycy ypa yps ysa ysc ysp yss yst ysy yta ytc ytp yts ytt yyc yys yyt yyy