-er a-a a-b a-t aaa aab aad aae aao aar aas aat aau ab- aba abb abd abe abo abr abs abt abu ad- ada adb add ade ado adr ads adt adu aea aeb aed aee aeo aer aes aet aeu aoa aob aod aoe aoo aor aos aot aou ar- ara arb ard are aro arr ars art aru as- asa asb asd ase aso asr ass ast asu at- ata atb atd ate ato atr ats att atu au- aua aub aud aue auo aur aus aut b-u baa bab bad bae bao bar bas bat bau bba bbb bbd bbe bbo bbr bbs bbt bbu bda bdb bdd bde bdo bdr bds bdt bdu be- bea beb bed bee beo ber bes bet beu boa bob bod boe boo bor bos bot bou bra brb brd bre bro brr brs brt bru bsa bsb bsd bse bso bsr bss bst bsu bta btb btd bte bto btr bts btt btu bua bub bud bue buo bur bus but buu daa dab dad dae dao dar das dat dau dba dbb dbd dbe dbo dbr dbs dbt dbu dda ddb ddd dde ddo ddr dds ddt ddu de- dea deb ded dee deo der des det deu doa dob dod doe doo dor dos dot dou dra drb drd dre dro drr drs drt dru dsa dsb dsd dse dso dsr dss dst dsu dta dtb dtd dte dto dtr dts dtt dtu dua dub dud due duo dur dus dut eaa eab ead eae eao ear eas eat eau eba ebb ebd ebe ebo ebr ebs ebt ebu ed- eda edb edd ede edo edr eds edt edu eea eeb eed eee eeo eer ees eet eo- eoa eob eod eoe eoo eor eos eot eou era erb erd ere ero err ers ert eru es- esa esb esd ese eso esr ess est esu eta etb etd ete eto etr ets ett etu eu- eua eub eud eue eur eus eut oaa oab oad oae oao oar oas oat oau ob- oba obb obd obe obo obr obs obt obu oda odb odd ode odo odr ods odt odu oea oeb oed oee oeo oer oes oet oo- ooa oob ood ooo oor oos oot or- ora orb ord ore oro orr ors ort oru os- osa osb osd ose oso osr oss ost osu ot- ota otb otd ote oto otr ots ott otu ou- oua oud oue ouo our ous out ra- raa rab rad rae rao rar ras rat rau rba rbb rbd rbe rbo rbr rbs rbt rbu rda rdb rdd rde rdo rdr rds rdt rdu re- rea reb red ree reo rer res ret reu roa rob rod roe roo ror ros rot rou rra rrb rrd rrr rrs rrt rru rsa rsb rsd rse rso rsr rss rst rsu rta rtb rtd rte rto rtr rts rtt rtu rua rub rud rue ruo rur rus rut ruu saa sab sad sae sao sar sas sat sau sba sbb sbd sbe sbo sbr sbs sbt sbu sda sdb sdd sde sdo sdr sds sdt sdu se- sea seb sed see seo ser ses set seu soa sob sod soe soo sor sos sot sou sr- sra srb srd sre sro srr srs srt ss- ssa ssb ssd sse sso ssr sss sst ssu sta stb std ste sto str sts stt stu sua sub sud sue suo sur sus sut suu taa tab tad tae tao tar tas tat tau tba tbb tbd tbe tbo tbr tbs tbt tbu tda tdb tdd tde tdo tdr tds tdt tdu te- tea teb ted tee teo ter tes tet teu to- toa tob tod toe too tor tos tot tou tra trb trd tre tro trr trs trt tru tsa tsb tsd tse tso tsr tss tst tsu tta ttb ttd tte tto ttr tts ttt ttu tua tub tud tue tuo tur tus tut tuu ua- uaa uab uad uae uao uar uas uat uau uba ubb ube ubo ubr ubs ubt ubu uda udb udd ude udo udr uds udt udu uea ueb ued uee uer ues uet uoa uob uod uoe uoo uor uos uot ur- ura urb urd ure uro urr urs urt uru usa usb usd use uso usr uss ust usu uta utb utd ute uto utr uts utt utu uua uue uur uus uut uuu