-er a-a a-b a-t aaa aab aad aae aao aar aat aau ab- aba abb abd abe abo abr abt abu ad- ada adb add ade ado adr adt adu aea aeb aed aee aeo aer aet aeu aoa aob aod aoe aoo aor aot aou ar- ara arb ard are aro arr art aru at- ata atb atd ate ato atr att atu au- aua aub aud aue auo aur aut b-u baa bab bad bae bao bar bat bau bba bbb bbd bbe bbo bbr bbt bbu bda bdb bdd bde bdo bdr bdt bdu be- bea beb bed bee beo ber bet beu boa bob bod boe boo bor bot bou bra brb brd bre bro brr brt bru bta btb btd bte bto btr btt btu bua bub bud bue buo bur but buu daa dab dad dae dao dar dat dau dba dbb dbd dbe dbo dbr dbt dbu dda ddb ddd dde ddo ddr ddt ddu de- dea deb ded dee deo der det deu doa dob dod doe doo dor dot dou dra drb drd dre dro drr drt dru dta dtb dtd dte dto dtr dtt dtu dua dub dud due duo dur dut eaa eab ead eae eao ear eat eau eba ebb ebd ebe ebo ebr ebt ebu ed- eda edb edd ede edo edr edt edu eea eeb eed eee eeo eer eet eo- eoa eob eod eoe eoo eor eot eou era erb erd ere ero err ert eru eta etb etd ete eto etr ett etu eu- eua eub eud eue eur eut oaa oab oad oae oao oar oat oau ob- oba obb obd obe obo obr obt obu oda odb odd ode odo odr odt odu oea oeb oed oee oeo oer oet oo- ooa oob ood ooo oor oot or- ora orb ord ore oro orr ort oru ot- ota otb otd ote oto otr ott otu ou- oua oud oue ouo our out ra- raa rab rad rae rao rar rat rau rba rbb rbd rbe rbo rbr rbt rbu rda rdb rdd rde rdo rdr rdt rdu re- rea reb red ree reo rer ret reu roa rob rod roe roo ror rot rou rra rrb rrd rrr rrt rru rta rtb rtd rte rto rtr rtt rtu rua rub rud rue ruo rur rut ruu taa tab tad tae tao tar tat tau tba tbb tbd tbe tbo tbr tbt tbu tda tdb tdd tde tdo tdr tdt tdu te- tea teb ted tee teo ter tet teu to- toa tob tod toe too tor tot tou tra trb trd tre tro trr trt tru tta ttb ttd tte tto ttr ttt ttu tua tub tud tue tuo tur tut tuu ua- uaa uab uad uae uao uar uat uau uba ubb ube ubo ubr ubt ubu uda udb udd ude udo udr udt udu uea ueb ued uee uer uet uoa uob uod uoe uoo uor uot ur- ura urb urd ure uro urr urt uru uta utb utd ute uto utr utt utu uua uue uur uut uuu