a-a a-c a-t aaa aac aad aan aat aay ac- aca acc acd acn act acy ad- ada adc add adn adt ady an- ana anc and ann ant any at- ata atc atd atn att ay- aya ayc ayd ayn ayt c-- caa cac cad can cat cay cca ccc ccd ccn cct cda cdc cdd cdn cdt cdy cn- cna cnc cnd cnn cnt cny cta ctc ctd ctn ctt cty cya cyc cyd cyn cyt daa dac dad dan dat day dca dcc dcd dcn dct dda ddc ddd ddn ddt ddy dna dnc dnd dnn dnt dny dta dtc dtd dtn dtt dty dy- dya dyc dyd dyn dyy naa nac nad nan nat nay nca ncc ncd ncn nct nda ndc ndd ndn ndt ndy nna nnc nnn nnt nta ntc ntd ntn ntt nya nyc nyd nyn nyt nyy taa tac tad tan tat tay tca tcc tcd tcn tct tda tdc tdd tdn tdt tdy tna tnc tnd tnn tnt tta ttc ttd ttn ttt tty tya tyc tyd tyn tyt yaa yac yad yan yat yay yca ycc ycd ycy yda ydn ydt ydy yna ynd ynn yny yta ytc ytd ytn ytt yyc yyt yyy