-er a-a a-b aaa aab aae aam aao aar aas aau aax ab- aba abb abe abm abo abr abs abu abx aea aeb aee aem aeo aer aes aeu aex ama amb ame amm amo amr ams amu amx aoa aob aoe aom aoo aor aos aou aox ar- ara arb are arm aro arr ars aru arx as- asa asb ase asm aso asr ass asu asx au- aua aub aue aum auo aur aus aux ax- axa axe axm axo axr axs axx b-u baa bab bae bam bao bar bas bau bax bba bbb bbe bbm bbo bbr bbs bbu bbx be- bea beb bee bem beo ber bes beu bex bma bmb bme bmm bmo bmr bms bmu bmx boa bob boe bom boo bor bos bou box bra brb bre brm bro brr brs bru brx bsa bsb bse bsm bso bsr bss bsu bsx bua bub bue bum buo bur bus buu bux bxb bxm bxo bxx eaa eab eae eam eao ear eas eau eax eba ebb ebe ebm ebo ebr ebs ebu ebx eea eeb eee eem eeo eer ees eex em- ema emb eme emm emo emr ems emu emx eo- eoa eob eoe eom eoo eor eos eou era erb ere erm ero err ers eru es- esa esb ese esm eso esr ess esu esx eu- eua eub eue eur eus eux ex- exa exe exo exr exs exu exx m-o m-r maa mab mae mam mao mar mas mau max mba mbb mbe mbm mbo mbr mbs mbu mbx mea meb mee mem meo mer mes meu mex mma mmb mme mmm mmo mmr mms mmu mmx moa mob moe mom moo mor mos mou mox mra mrb mre mrm mro mrr mrs mru mrx msa msb mse msm mso msr mss msu msx mua mub mue mum mur mus muu mux mxa mxr mxs mxu oaa oab oae oam oao oar oas oau oax ob- oba obb obe obm obo obr obs obu obx oea oeb oee oem oeo oer oes oex om- oma omb ome omm omo omr oms omu omx oo- ooa oob oom ooo oor oos oox or- ora orb ore orm oro orr ors oru orx os- osa osb ose osm oso osr oss osu osx ou- oua oue oum ouo our ous ox- oxa oxb oxo oxx ra- raa rab rae ram rao rar ras rau rax rba rbb rbe rbm rbo rbr rbs rbu rbx re- rea reb ree rem reo rer res reu rex rma rmb rme rmm rmo rmr rms rmx roa rob roe rom roo ror ros rou rox rra rrb rrm rrr rrs rru rsa rsb rse rsm rso rsr rss rsu rsx rua rub rue rum ruo rur rus ruu rux rxr rxs saa sab sae sam sao sar sas sau sax sba sbb sbe sbm sbo sbr sbs sbu sbx se- sea seb see sem seo ser ses seu sex sma smb sme smm smo smr sms smu smx soa sob soe som soo sor sos sou sox sr- sra srb sre srm sro srr srs srx ss- ssa ssb sse ssm sso ssr sss ssu ssx sua sub sue sum suo sur sus suu sux sxm sxs sxu ua- uaa uab uae uam uao uar uas uau uba ubb ube ubo ubr ubs ubu ubx uea ueb uee uem uer ues um- uma umb ume umm umo umr ums umu uoa uob uoe uom uoo uor uos uox ur- ura urb ure urm uro urr urs uru urx usa usb use usm uso usr uss usu usx uua uue uum uur uus uuu uxb uxo uxr uxu xaa xam xar xas xau xbe xbr xbx xee xem xer xes xeu xex xma xmm xmo xmr xms xmu xmx xoa xom xoo xor xos xox xrx xsa xsb xsm xss xue xus xxo xxx