bbb bbe bbk bbn bbs be- beb bee bek ben bes bkb bke bkk bkn bks bnb bne bnk bnn bns bsb bse bsk bsn bss ebb ebe ebk ebn ebs eeb eee eek een ees ekb eke eks en- enb ene enk enn ens es- esb ese esk esn ess kbb kbe kbk kbn kbs ke- keb kee kek ken kes kkb kke kkk kkn kks kn- kne knk knn ksb kse ksk ksn kss nbb nbe nbk nbn nbs ne- neb nee nek nen nes nke nkk nkn nks nnb nne nnk nnn nns nsb nse nsk nsn nss sbb sbe sbk sbn sbs se- seb see sek sen ses sk- skb ske skk sks snb sne snk snn sns ss- ssb sse ssk ssn sss