a-a a-c a-t aaa aac aao aas aat aay ac- aca acc aco acs act acy aoa aoc aoo aos aot as- asa asc aso ass ast asy at- ata atc ato ats att ay- aya ayc ayo ays ayt c-- caa cac cao cas cat cay cca ccc cco ccs cct co- coa coc coo cos cot coy csa csc cso css cst csy cta ctc cto cts ctt cty cya cyc cyo cys cyt oaa oac oao oas oat oc- oca occ oco ocs oct oo- ooa ooc ooo oos oot os- osa osc oso oss ost ot- ota otc oto ots ott oya oyo oys saa sac sao sas sat say sca scc sco scs sct soa soc soo sos sot soy ss- ssa ssc sso sss sst sta stc sto sts stt sty sy- sya syc sys syt taa tac tao tas tat tay tca tcc tco tcs tct to- toa toc too tos tot toy tsa tsc tso tss tst tsy tta ttc tto tts ttt tty tya tyc tyo tys tyt yaa yac yao yas yat yay yca ycc yco ycs ycy yoc yoo yos yot yoy ysa ysc yso yss yst ysy yta ytc yto yts ytt yyc yys yyt yyy