bbb bbc bbe bbk bbl bbn bcb bcc bce bck bcl bcn bcz be- beb bec bee bek bel ben bez bkb bkc bke bkk bkl bkn blb blc ble blk bll bln blz bnb bnc bne bnk bnl bnn bnz bze bzn bzz c-- cbb cbc cbe cbk cbl cbn cbz ccb ccc cce cck ccl ccn ccz ce- ceb cec cee cek cel cen cez ckb ckc cl- clb clc cle clk cll cln clz cn- cnb cnc cne cnl cnn cz- czc cze czk ebb ebc ebe ebk ebl ebn ec- ecb ecc ece eck ecl ecn eeb eec eee eek eel een ekb ekc eke ekl elb elc ele elk ell eln elz en- enb enc ene enk enl enn enz eze ezz k-z kbb kbc kbe kbk kbl kbn kbz kcb kcc kce kck kcl kcn ke- keb kec kee kek kel ken kez kkb kkc kke kkk kkl kkn kl- klb klc klz kn- knc kne knk knl knn lbb lbc lbe lbk lbl lcb lcc lce lck lcl lcn leb lec lee lek lel len lez lkb lkl llb llc lle llk lll lln llz lnb lnc lne lnk lnl lnn nbb nbc nbe nbk nbl nbn ncb ncc nce nck ncl ncn ne- neb nec nee nek nel nen nez nkc nke nkk nkn nlb nlc nle nlk nll nln nlz nnb nnc nne nnk nnl nnn nnz nzb nze nzz zbb zbc zbl zce zcl zeb zec zee zek zel zen zez znc zne znn zzz