a-a a-b a-t aaa aab aad aan aao aar aas aat ab- aba abb abd abn abo abr abs abt ad- ada adb add adn ado adr ads adt an- ana anb and ann ano anr ans ant aoa aob aod aon aoo aor aos aot ar- ara arb ard arn aro arr ars art as- asa asb asd asn aso asr ass ast at- ata atb atd atn ato atr ats att baa bab bad ban bao bar bas bat bba bbb bbd bbn bbo bbr bbs bbt bda bdb bdd bdo bdr bds bdt bna bnb bnd bnn bno bnr bns bnt boa bob bod bon boo bor bos bot bra brb brd brn bro brr brs brt bsa bsb bsd bsn bso bsr bss bst bta btb btd btn bto btr bts btt daa dab dad dan dao dar das dat dba dbb dbd dbn dbo dbr dbs dbt dda ddb ddd ddn ddo ddr dds ddt dna dnb dnd dnn dno dnr dns dnt doa dob dod don doo dor dos dot dra drb drd drn dro drr drs drt dsa dsb dsd dsn dso dsr dss dst dta dtb dtd dtn dto dtr dts dtt naa nab nad nan nao nar nas nat nba nbb nbd nbn nbo nbr nbs nbt nda ndb ndd ndn ndo ndr nds ndt nna nnb nnn nno nns nnt no- noa nob nod non noo nor nos not nra nrb nrd nrn nro nrr nrs nrt nsa nsb nsd nsn nso nsr nss nst nta ntb ntd ntn nto ntr nts ntt oaa oab oad oan oao oar oas oat ob- oba obb obd obn obo obr obs obt oda odb odd odn odo odr ods odt on- ona onb ond onn ono onr ons ont oo- ooa oob ood oon ooo oor oos oot or- ora orb ord orn oro orr ors ort os- osa osb osd osn oso osr oss ost ot- ota otb otd otn oto otr ots ott ra- raa rab rad ran rao rar ras rat rba rbb rbd rbn rbo rbr rbs rbt rda rdb rdd rdn rdo rdr rds rdt rna rnb rnd rnn rno rnr rns rnt roa rob rod ron roo ror ros rot rra rrb rrd rrn rrr rrs rrt rsa rsb rsd rsn rso rsr rss rst rta rtb rtd rtn rto rtr rts rtt saa sab sad san sao sar sas sat sba sbb sbd sbn sbo sbr sbs sbt sda sdb sdd sdn sdo sdr sds sdt sna snb snd snn sno snr sns snt soa sob sod son soo sor sos sot sr- sra srb srd srn sro srr srs srt ss- ssa ssb ssd ssn sso ssr sss sst sta stb std stn sto str sts stt taa tab tad tan tao tar tas tat tba tbb tbd tbn tbo tbr tbs tbt tda tdb tdd tdn tdo tdr tds tdt tna tnb tnd tnn tno tnr tns tnt to- toa tob tod ton too tor tos tot tra trb trd trn tro trr trs trt tsa tsb tsd tsn tso tsr tss tst tta ttb ttd ttn tto ttr tts ttt