a-a a-b a-t aaa aab aad aan aar aas aat ab- aba abb abd abn abr abs abt ad- ada adb add adn adr ads adt an- ana anb and ann anr ans ant ar- ara arb ard arn arr ars art as- asa asb asd asn asr ass ast at- ata atb atd atn atr ats att baa bab bad ban bar bas bat bba bbb bbd bbn bbr bbs bbt bda bdb bdd bdr bds bdt bna bnb bnd bnn bnr bns bnt bra brb brd brn brr brs brt bsa bsb bsd bsn bsr bss bst bta btb btd btn btr bts btt daa dab dad dan dar das dat dba dbb dbd dbn dbr dbs dbt dda ddb ddd ddn ddr dds ddt dna dnb dnd dnn dnr dns dnt dra drb drd drn drr drs drt dsa dsb dsd dsn dsr dss dst dta dtb dtd dtn dtr dts dtt naa nab nad nan nar nas nat nba nbb nbd nbn nbr nbs nbt nda ndb ndd ndn ndr nds ndt nna nnb nnn nns nnt nra nrb nrd nrn nrr nrs nrt nsa nsb nsd nsn nsr nss nst nta ntb ntd ntn ntr nts ntt ra- raa rab rad ran rar ras rat rba rbb rbd rbn rbr rbs rbt rda rdb rdd rdn rdr rds rdt rna rnb rnd rnn rnr rns rnt rra rrb rrd rrn rrr rrs rrt rsa rsb rsd rsn rsr rss rst rta rtb rtd rtn rtr rts rtt saa sab sad san sar sas sat sba sbb sbd sbn sbr sbs sbt sda sdb sdd sdn sdr sds sdt sna snb snd snn snr sns snt sr- sra srb srd srn srr srs srt ss- ssa ssb ssd ssn ssr sss sst sta stb std stn str sts stt taa tab tad tan tar tas tat tba tbb tbd tbn tbr tbs tbt tda tdb tdd tdn tdr tds tdt tna tnb tnd tnn tnr tns tnt tra trb trd trn trr trs trt tsa tsb tsd tsn tsr tss tst tta ttb ttd ttn ttr tts ttt