a-a a-b a-c a-t aaa aab aac aad aan aao aar aas aat ab- aba abb abc abd abn abo abr abs abt ac- aca acb acc acd acn aco acr acs act ad- ada adb adc add adn ado adr ads adt an- ana anb anc and ann ano anr ans ant aoa aob aoc aod aon aoo aor aos aot ar- ara arb arc ard arn aro arr ars art as- asa asb asc asd asn aso asr ass ast at- ata atb atc atd atn ato atr ats att baa bab bac bad ban bao bar bas bat bba bbb bbc bbd bbn bbo bbr bbs bbt bca bcb bcc bcd bcn bco bcr bcs bct bda bdb bdc bdd bdo bdr bds bdt bna bnb bnc bnd bnn bno bnr bns bnt boa bob boc bod bon boo bor bos bot bra brb brd brn bro brr brs brt bsa bsb bsc bsd bsn bso bsr bss bst bta btb btc btd btn bto btr bts btt c-- caa cab cac cad can cao car cas cat cba cbb cbc cbd cbn cbo cbr cbs cbt cca ccb ccc ccd ccn cco ccr ccs cct cda cdb cdc cdd cdn cdo cdr cds cdt cn- cna cnb cnc cnd cnn cno cnr cns cnt co- coa cob coc cod con coo cor cos cot cra crb crc crd crn cro crr crs crt csa csb csc csd csn cso csr css cst cta ctb ctc ctd ctn cto ctr cts ctt daa dab dac dad dan dao dar das dat dba dbb dbc dbd dbn dbo dbr dbs dbt dca dcb dcc dcd dcn dco dcr dcs dct dda ddb ddc ddd ddn ddo ddr dds ddt dna dnb dnc dnd dnn dno dnr dns dnt doa dob doc dod don doo dor dos dot dra drb drc drd drn dro drr drs drt dsa dsb dsc dsd dsn dso dsr dss dst dta dtb dtc dtd dtn dto dtr dts dtt naa nab nac nad nan nao nar nas nat nba nbb nbc nbd nbn nbo nbr nbs nbt nca ncb ncc ncd ncn nco ncr ncs nct nda ndb ndc ndd ndn ndo ndr nds ndt nna nnb nnc nnn nno nns nnt no- noa nob noc nod non noo nor nos not nra nrb nrc nrd nrn nro nrr nrs nrt nsa nsb nsc nsd nsn nso nsr nss nst nta ntb ntc ntd ntn nto ntr nts ntt oaa oab oac oad oan oao oar oas oat ob- oba obb obc obd obn obo obr obs obt oc- oca ocb occ ocd ocn oco ocr ocs oct oda odb odc odd odn odo odr ods odt on- ona onb onc ond onn ono onr ons ont oo- ooa oob ooc ood oon ooo oor oos oot or- ora orb orc ord orn oro orr ors ort os- osa osb osc osd osn oso osr oss ost ot- ota otb otc otd otn oto otr ots ott ra- raa rab rac rad ran rao rar ras rat rba rbb rbc rbd rbn rbo rbr rbs rbt rca rcb rcc rcd rcn rco rcr rcs rct rda rdb rdc rdd rdn rdo rdr rds rdt rna rnb rnc rnd rnn rno rnr rns rnt roa rob roc rod ron roo ror ros rot rra rrb rrc rrd rrn rrr rrs rrt rsa rsb rsc rsd rsn rso rsr rss rst rta rtb rtc rtd rtn rto rtr rts rtt saa sab sac sad san sao sar sas sat sba sbb sbc sbd sbn sbo sbr sbs sbt sca scb scc scd scn sco scr scs sct sda sdb sdc sdd sdn sdo sdr sds sdt sna snb snc snd snn sno snr sns snt soa sob soc sod son soo sor sos sot sr- sra srb src srd srn sro srr srs srt ss- ssa ssb ssc ssd ssn sso ssr sss sst sta stb stc std stn sto str sts stt taa tab tac tad tan tao tar tas tat tba tbb tbc tbd tbn tbo tbr tbs tbt tca tcb tcc tcd tcn tco tcr tcs tct tda tdb tdc tdd tdn tdo tdr tds tdt tna tnb tnc tnd tnn tno tnr tns tnt to- toa tob toc tod ton too tor tos tot tra trb trc trd trn tro trr trs trt tsa tsb tsc tsd tsn tso tsr tss tst tta ttb ttc ttd ttn tto ttr tts ttt