a-a a-b a-c a-t aaa aab aac aad aao aar aas aat aau ab- aba abb abc abd abo abr abs abt abu ac- aca acb acc acd aco acr acs act acu ad- ada adb adc add ado adr ads adt adu aoa aob aoc aod aoo aor aos aot aou ar- ara arb arc ard aro arr ars art aru as- asa asb asc asd aso asr ass ast asu at- ata atb atc atd ato atr ats att atu au- aua aub auc aud auo aur aus aut b-u baa bab bac bad bao bar bas bat bau bba bbb bbc bbd bbo bbr bbs bbt bbu bca bcb bcc bcd bco bcr bcs bct bcu bda bdb bdc bdd bdo bdr bds bdt bdu boa bob boc bod boo bor bos bot bou bra brb brd bro brr brs brt bru bsa bsb bsc bsd bso bsr bss bst bsu bta btb btc btd bto btr bts btt btu bua bub buc bud buo bur bus but buu c-- caa cab cac cad cao car cas cat cau cba cbb cbc cbd cbo cbr cbs cbt cbu cca ccb ccc ccd cco ccr ccs cct ccu cda cdb cdc cdd cdo cdr cds cdt cdu co- coa cob coc cod coo cor cos cot cou cra crb crc crd cro crr crs crt cru csa csb csc csd cso csr css cst csu cta ctb ctc ctd cto ctr cts ctt ctu cua cub cuc cud cuo cur cus cut cuu daa dab dac dad dao dar das dat dau dba dbb dbc dbd dbo dbr dbs dbt dbu dca dcb dcc dcd dco dcr dcs dct dcu dda ddb ddc ddd ddo ddr dds ddt ddu doa dob doc dod doo dor dos dot dou dra drb drc drd dro drr drs drt dru dsa dsb dsc dsd dso dsr dss dst dsu dta dtb dtc dtd dto dtr dts dtt dtu dua dub duc dud duo dur dus dut oaa oab oac oad oao oar oas oat oau ob- oba obb obc obd obo obr obs obt obu oc- oca ocb occ ocd oco ocr ocs oct ocu oda odb odc odd odo odr ods odt odu oo- ooa oob ooc ood ooo oor oos oot or- ora orb orc ord oro orr ors ort oru os- osa osb osc osd oso osr oss ost osu ot- ota otb otc otd oto otr ots ott otu ou- oua ouc oud ouo our ous out ra- raa rab rac rad rao rar ras rat rau rba rbb rbc rbd rbo rbr rbs rbt rbu rca rcb rcc rcd rco rcr rcs rct rcu rda rdb rdc rdd rdo rdr rds rdt rdu roa rob roc rod roo ror ros rot rou rra rrb rrc rrd rrr rrs rrt rru rsa rsb rsc rsd rso rsr rss rst rsu rta rtb rtc rtd rto rtr rts rtt rtu rua rub ruc rud ruo rur rus rut ruu saa sab sac sad sao sar sas sat sau sba sbb sbc sbd sbo sbr sbs sbt sbu sca scb scc scd sco scr scs sct scu sda sdb sdc sdd sdo sdr sds sdt sdu soa sob soc sod soo sor sos sot sou sr- sra srb src srd sro srr srs srt ss- ssa ssb ssc ssd sso ssr sss sst ssu sta stb stc std sto str sts stt stu sua sub suc sud suo sur sus sut suu taa tab tac tad tao tar tas tat tau tba tbb tbc tbd tbo tbr tbs tbt tbu tca tcb tcc tcd tco tcr tcs tct tcu tda tdb tdc tdd tdo tdr tds tdt tdu to- toa tob toc tod too tor tos tot tou tra trb trc trd tro trr trs trt tru tsa tsb tsc tsd tso tsr tss tst tsu tta ttb ttc ttd tto ttr tts ttt ttu tua tub tuc tud tuo tur tus tut tuu ua- uaa uab uac uad uao uar uas uat uau uba ubb ubc ubo ubr ubs ubt ubu uca ucb ucc ucd uco ucr ucs uct ucu uda udb udc udd udo udr uds udt udu uoa uob uoc uod uoo uor uos uot ur- ura urb urc urd uro urr urs urt uru usa usb usc usd uso usr uss ust usu uta utb utc utd uto utr uts utt utu uua uuc uur uus uut uuu