a-a a-c a-t a-z aaa aac aas aat aay aaz ac- aca acc acs act acy acz as- asa asc ass ast asy asz at- ata atc ats att atz ay- aya ayc ays ayt ayz az- aza azs azt azy azz c-- caa cac cas cat cay caz cca ccc ccs cct ccz csa csc css cst csy csz cta ctc cts ctt cty ctz cya cyc cys cyt cz- czc czt saa sac sas sat say saz sca scc scs sct ss- ssa ssc sss sst ssz sta stc sts stt sty stz sy- sya syc sys syt sza taa tac tas tat tay taz tca tcc tcs tct tsa tsc tss tst tsy tta ttc tts ttt tty tya tyc tys tyt tza tzs yaa yac yas yat yay yaz yca ycc ycs ycy ysa ysc yss yst ysy ysz yta ytc yts ytt yyc yys yyt yyy yyz yzy zaa zac zas zat zay zaz zcs zsa zst zsz zta zzs zzt zzy zzz