bbb bbe bbk bbl bbn bbs be- beb bee bek bel ben bes bkb bke bkk bkl bkn bks blb ble blk bll bln bls bnb bne bnk bnl bnn bns bsb bse bsk bsl bsn bss ebb ebe ebk ebl ebn ebs eeb eee eek eel een ees ekb eke ekl eks elb ele elk ell eln els en- enb ene enk enl enn ens es- esb ese esk esl esn ess kbb kbe kbk kbl kbn kbs ke- keb kee kek kel ken kes kkb kke kkk kkl kkn kks kl- klb kls kn- kne knk knl knn ksb kse ksk ksl ksn kss lbb lbe lbk lbl lbs leb lee lek lel len les lkb lkl lks llb lle llk lll lln lls lnb lne lnk lnl lnn lns lsb lse lsk lsl lsn lss nbb nbe nbk nbl nbn nbs ne- neb nee nek nel nen nes nke nkk nkn nks nlb nle nlk nll nln nls nnb nne nnk nnl nnn nns nsb nse nsk nsl nsn nss sbb sbe sbk sbl sbn sbs se- seb see sek sel sen ses sk- skb ske skk skl sks slb sle slk sll sln sls snb sne snk snl snn sns ss- ssb sse ssk ssl ssn sss