-er b-u bbb bbe bbm bbn bbr bbs bbu bbx be- beb bee bem ben ber bes beu bex bmb bme bmm bmn bmr bms bmu bmx bnb bne bnn bnr bns bnu bnx brb bre brm brn brr brs bru brx bsb bse bsm bsn bsr bss bsu bsx bub bue bum bun bur bus buu bux bxb bxm bxn bxx ebb ebe ebm ebn ebr ebs ebu ebx eeb eee eem een eer ees eex em- emb eme emm emn emr ems emu emx en- enb ene enm enn enr ens enu erb ere erm ern err ers eru es- esb ese esm esn esr ess esu esx eu- eub eue eun eur eus eux ex- exe exr exs exu exx m-r mbb mbe mbm mbr mbs mbu mbx meb mee mem men mer mes meu mex mmb mme mmm mmn mmr mms mmu mmx mnb mne mnm mnn mnr mns mnu mrb mre mrm mrn mrr mrs mru mrx msb mse msm msn msr mss msu msx mub mue mum mun mur mus muu mux mxn mxr mxs mxu nbb nbe nbm nbn nbr nbs nbu nbx ne- neb nee nem nen ner nes neu nex nmb nme nmm nmn nmr nms nmu nnb nne nnm nnn nns nnu nrb nre nrm nrn nrr nrs nru nrx nsb nse nsm nsn nsr nss nsu nsx nub nue num nun nur nus nuu nux rbb rbe rbm rbn rbr rbs rbu rbx re- reb ree rem ren rer res reu rex rmb rme rmm rmn rmr rms rmx rnb rnm rnn rnr rns rnu rrb rrm rrn rrr rrs rru rsb rse rsm rsn rsr rss rsu rsx rub rue rum run rur rus ruu rux rxr rxs sbb sbe sbm sbn sbr sbs sbu sbx se- seb see sem sen ser ses seu sex smb sme smm smn smr sms smu smx snb sne snm snn snr sns snu sr- srb sre srm srn srr srs srx ss- ssb sse ssm ssn ssr sss ssu ssx sub sue sum sun sur sus suu sux sxm sxn sxs sxu ubb ube ubn ubr ubs ubu ubx ueb uee uem uen uer ues um- umb ume umm umn umr ums umu un- unb une unm unn unr uns unu unx ur- urb ure urm urn urr urs uru urx usb use usm usn usr uss usu usx uue uum uun uur uus uuu uxb uxr uxu xbe xbr xbx xee xem xen xer xes xeu xex xmm xmr xms xmu xmx xns xnu xrx xsb xsm xss xue xun xus xxx