a-a a-c a-t aaa aac aad aan aas aat ac- aca acc acd acn acs act ad- ada adc add adn ads adt an- ana anc and ann ans ant as- asa asc asd asn ass ast at- ata atc atd atn ats att c-- caa cac cad can cas cat cca ccc ccd ccn ccs cct cda cdc cdd cdn cds cdt cn- cna cnc cnd cnn cns cnt csa csc csd csn css cst cta ctc ctd ctn cts ctt daa dac dad dan das dat dca dcc dcd dcn dcs dct dda ddc ddd ddn dds ddt dna dnc dnd dnn dns dnt dsa dsc dsd dsn dss dst dta dtc dtd dtn dts dtt naa nac nad nan nas nat nca ncc ncd ncn ncs nct nda ndc ndd ndn nds ndt nna nnc nnn nns nnt nsa nsc nsd nsn nss nst nta ntc ntd ntn nts ntt saa sac sad san sas sat sca scc scd scn scs sct sda sdc sdd sdn sds sdt sna snc snd snn sns snt ss- ssa ssc ssd ssn sss sst sta stc std stn sts stt taa tac tad tan tas tat tca tcc tcd tcn tcs tct tda tdc tdd tdn tds tdt tna tnc tnd tnn tns tnt tsa tsc tsd tsn tss tst tta ttc ttd ttn tts ttt