a-a a-b a-t aaa aab aad aao aar aas aat aau ab- aba abb abd abo abr abs abt abu ad- ada adb add ado adr ads adt adu aoa aob aod aoo aor aos aot aou ar- ara arb ard aro arr ars art aru as- asa asb asd aso asr ass ast asu at- ata atb atd ato atr ats att atu au- aua aub aud auo aur aus aut b-u baa bab bad bao bar bas bat bau bba bbb bbd bbo bbr bbs bbt bbu bda bdb bdd bdo bdr bds bdt bdu boa bob bod boo bor bos bot bou bra brb brd bro brr brs brt bru bsa bsb bsd bso bsr bss bst bsu bta btb btd bto btr bts btt btu bua bub bud buo bur bus but buu daa dab dad dao dar das dat dau dba dbb dbd dbo dbr dbs dbt dbu dda ddb ddd ddo ddr dds ddt ddu doa dob dod doo dor dos dot dou dra drb drd dro drr drs drt dru dsa dsb dsd dso dsr dss dst dsu dta dtb dtd dto dtr dts dtt dtu dua dub dud duo dur dus dut oaa oab oad oao oar oas oat oau ob- oba obb obd obo obr obs obt obu oda odb odd odo odr ods odt odu oo- ooa oob ood ooo oor oos oot or- ora orb ord oro orr ors ort oru os- osa osb osd oso osr oss ost osu ot- ota otb otd oto otr ots ott otu ou- oua oud ouo our ous out ra- raa rab rad rao rar ras rat rau rba rbb rbd rbo rbr rbs rbt rbu rda rdb rdd rdo rdr rds rdt rdu roa rob rod roo ror ros rot rou rra rrb rrd rrr rrs rrt rru rsa rsb rsd rso rsr rss rst rsu rta rtb rtd rto rtr rts rtt rtu rua rub rud ruo rur rus rut ruu saa sab sad sao sar sas sat sau sba sbb sbd sbo sbr sbs sbt sbu sda sdb sdd sdo sdr sds sdt sdu soa sob sod soo sor sos sot sou sr- sra srb srd sro srr srs srt ss- ssa ssb ssd sso ssr sss sst ssu sta stb std sto str sts stt stu sua sub sud suo sur sus sut suu taa tab tad tao tar tas tat tau tba tbb tbd tbo tbr tbs tbt tbu tda tdb tdd tdo tdr tds tdt tdu to- toa tob tod too tor tos tot tou tra trb trd tro trr trs trt tru tsa tsb tsd tso tsr tss tst tsu tta ttb ttd tto ttr tts ttt ttu tua tub tud tuo tur tus tut tuu ua- uaa uab uad uao uar uas uat uau uba ubb ubo ubr ubs ubt ubu uda udb udd udo udr uds udt udu uoa uob uod uoo uor uos uot ur- ura urb urd uro urr urs urt uru usa usb usd uso usr uss ust usu uta utb utd uto utr uts utt utu uua uur uus uut uuu