a-a a-b a-c a-t aaa aab aac aad aan aao aar aas aat aau ab- aba abb abc abd abn abo abr abs abt abu ac- aca acb acc acd acn aco acr acs act acu ad- ada adb adc add adn ado adr ads adt adu an- ana anb anc and ann ano anr ans ant anu aoa aob aoc aod aon aoo aor aos aot aou ar- ara arb arc ard arn aro arr ars art aru as- asa asb asc asd asn aso asr ass ast asu at- ata atb atc atd atn ato atr ats att atu au- aua aub auc aud aun auo aur aus aut b-u baa bab bac bad ban bao bar bas bat bau bba bbb bbc bbd bbn bbo bbr bbs bbt bbu bca bcb bcc bcd bcn bco bcr bcs bct bcu bda bdb bdc bdd bdo bdr bds bdt bdu bna bnb bnc bnd bnn bno bnr bns bnt bnu boa bob boc bod bon boo bor bos bot bou bra brb brd brn bro brr brs brt bru bsa bsb bsc bsd bsn bso bsr bss bst bsu bta btb btc btd btn bto btr bts btt btu bua bub buc bud bun buo bur bus but buu c-- caa cab cac cad can cao car cas cat cau cba cbb cbc cbd cbn cbo cbr cbs cbt cbu cca ccb ccc ccd ccn cco ccr ccs cct ccu cda cdb cdc cdd cdn cdo cdr cds cdt cdu cn- cna cnb cnc cnd cnn cno cnr cns cnt cnu co- coa cob coc cod con coo cor cos cot cou cra crb crc crd crn cro crr crs crt cru csa csb csc csd csn cso csr css cst csu cta ctb ctc ctd ctn cto ctr cts ctt ctu cua cub cuc cud cun cuo cur cus cut cuu daa dab dac dad dan dao dar das dat dau dba dbb dbc dbd dbn dbo dbr dbs dbt dbu dca dcb dcc dcd dcn dco dcr dcs dct dcu dda ddb ddc ddd ddn ddo ddr dds ddt ddu dna dnb dnc dnd dnn dno dnr dns dnt doa dob doc dod don doo dor dos dot dou dra drb drc drd drn dro drr drs drt dru dsa dsb dsc dsd dsn dso dsr dss dst dsu dta dtb dtc dtd dtn dto dtr dts dtt dtu dua dub duc dud dun duo dur dus dut naa nab nac nad nan nao nar nas nat nau nba nbb nbc nbd nbn nbo nbr nbs nbt nbu nca ncb ncc ncd ncn nco ncr ncs nct ncu nda ndb ndc ndd ndn ndo ndr nds ndt ndu nna nnb nnc nnn nno nns nnt nnu no- noa nob noc nod non noo nor nos not nou nra nrb nrc nrd nrn nro nrr nrs nrt nru nsa nsb nsc nsd nsn nso nsr nss nst nsu nta ntb ntc ntd ntn nto ntr nts ntt ntu nua nub nuc nud nun nuo nur nus nut nuu oaa oab oac oad oan oao oar oas oat oau ob- oba obb obc obd obn obo obr obs obt obu oc- oca ocb occ ocd ocn oco ocr ocs oct ocu oda odb odc odd odn odo odr ods odt odu on- ona onb onc ond onn ono onr ons ont onu oo- ooa oob ooc ood oon ooo oor oos oot or- ora orb orc ord orn oro orr ors ort oru os- osa osb osc osd osn oso osr oss ost osu ot- ota otb otc otd otn oto otr ots ott otu ou- oua ouc oud oun ouo our ous out ra- raa rab rac rad ran rao rar ras rat rau rba rbb rbc rbd rbn rbo rbr rbs rbt rbu rca rcb rcc rcd rcn rco rcr rcs rct rcu rda rdb rdc rdd rdn rdo rdr rds rdt rdu rna rnb rnc rnd rnn rno rnr rns rnt rnu roa rob roc rod ron roo ror ros rot rou rra rrb rrc rrd rrn rrr rrs rrt rru rsa rsb rsc rsd rsn rso rsr rss rst rsu rta rtb rtc rtd rtn rto rtr rts rtt rtu rua rub ruc rud run ruo rur rus rut ruu saa sab sac sad san sao sar sas sat sau sba sbb sbc sbd sbn sbo sbr sbs sbt sbu sca scb scc scd scn sco scr scs sct scu sda sdb sdc sdd sdn sdo sdr sds sdt sdu sna snb snc snd snn sno snr sns snt snu soa sob soc sod son soo sor sos sot sou sr- sra srb src srd srn sro srr srs srt ss- ssa ssb ssc ssd ssn sso ssr sss sst ssu sta stb stc std stn sto str sts stt stu sua sub suc sud sun suo sur sus sut suu taa tab tac tad tan tao tar tas tat tau tba tbb tbc tbd tbn tbo tbr tbs tbt tbu tca tcb tcc tcd tcn tco tcr tcs tct tcu tda tdb tdc tdd tdn tdo tdr tds tdt tdu tna tnb tnc tnd tnn tno tnr tns tnt to- toa tob toc tod ton too tor tos tot tou tra trb trc trd trn tro trr trs trt tru tsa tsb tsc tsd tsn tso tsr tss tst tsu tta ttb ttc ttd ttn tto ttr tts ttt ttu tua tub tuc tud tun tuo tur tus tut tuu ua- uaa uab uac uad uan uao uar uas uat uau uba ubb ubc ubn ubo ubr ubs ubt ubu uca ucb ucc ucd ucn uco ucr ucs uct ucu uda udb udc udd udn udo udr uds udt udu un- una unb unc und unn uno unr uns unt unu uoa uob uoc uod uon uoo uor uos uot ur- ura urb urc urd urn uro urr urs urt uru usa usb usc usd usn uso usr uss ust usu uta utb utc