b-u bbb bbe bbl bbn bbs bbu be- beb bee bel ben bes beu bev blb ble bll bln bls blu blv bnb bne bnl bnn bns bnu bnv bsb bse bsl bsn bss bsu bsv bub bue bul bun bus buu bvb bve bvl bvn bvs bvu bvv ebb ebe ebl ebn ebs ebu ebv eeb eee eel een ees eev elb ele ell eln els elu elv en- enb ene enl enn ens enu env es- esb ese esl esn ess esu esv eu- eub eue eul eun eus euv evb eve evl evn evs evv lbb lbe lbl lbs lbu lbv leb lee lel len les leu lev llb lle lll lln lls llu llv lnb lne lnl lnn lns lnu lsb lse lsl lsn lss lsu lsv lub lue lul lun lus luu luv lvb lve lvl lvn lvs lvv nbb nbe nbl nbn nbs nbu nbv ne- neb nee nel nen nes neu nev nlb nle nll nln nls nlu nlv nnb nne nnl nnn nns nnu nnv nsb nse nsl nsn nss nsu nsv nub nue nul nun nus nuu nuv nvb nve nvl nvn nvu nvv sbb sbe sbl sbn sbs sbu sbv se- seb see sel sen ses seu sev slb sle sll sln sls slu slv snb sne snl snn sns snu snv ss- ssb sse ssl ssn sss ssu ssv sub sue sul sun sus suu suv svb sve svl svn svs svu svv ubb ube ubl ubn ubs ubu ubv ueb uee uel uen ues ulb ule ull uln uls ulu ulv un- unb une unl unn uns unu unv usb use usl usn uss usu usv uue uun uus uuu uvb uve uvl uvs uvu uvv v-e vbl vbs vbv veb vee vel ven ves veu vl- vlb vle vll vls vlv vn- vnl vns vnu vnv vsb vse vsl vsn vss vsu vsv vue vul vus vuv vvb vvs vvv