b-u bbb bbe bbl bbm bbn bbu be- beb bee bel bem ben beu blb ble bll blm bln blu bmb bme bml bmm bmn bmu bnb bne bnl bnn bnu bub bue bul bum bun buu ebb ebe ebl ebm ebn ebu eeb eee eel eem een elb ele ell elm eln elu em- emb eme eml emm emn emu en- enb ene enl enm enn enu eu- eub eue eul eun lbb lbe lbl lbm lbu leb lee lel lem len leu llb lle lll llm lln llu lmb lme lml lmm lmn lmu lnb lne lnl lnm lnn lnu lub lue lul lum lun luu mbb mbe mbl mbm mbu meb mee mel mem men meu mlb mle mll mlm mln mlu mmb mme mml mmm mmn mmu mnb mne mnl mnm mnn mnu mub mue mul mum mun muu nbb nbe nbl nbm nbn nbu ne- neb nee nel nem nen neu nlb nle nll nlm nln nlu nmb nme nml nmm nmn nmu nnb nne nnl nnm nnn nnu nub nue nul num nun nuu ubb ube ubl ubn ubu ueb uee uel uem uen ulb ule ull ulm uln ulu um- umb ume uml umm umn umu un- unb une unl unm unn unu uue uum uun uuu