b-u bbb bbc bbe bbk bbl bbn bbu bcb bcc bce bck bcl bcn bcu bcz be- beb bec bee bek bel ben beu bez bkb bkc bke bkk bkl bkn blb blc ble blk bll bln blu blz bnb bnc bne bnk bnl bnn bnu bnz bub buc bue buk bul bun buu buz bze bzn bzu bzz c-- cbb cbc cbe cbk cbl cbn cbu cbz ccb ccc cce cck ccl ccn ccu ccz ce- ceb cec cee cek cel cen ceu cez ckb ckc cl- clb clc cle clk cll cln clu clz cn- cnb cnc cne cnl cnn cnu cub cuc cue cuk cul cun cuu cuz cz- czc cze czk ebb ebc ebe ebk ebl ebn ebu ec- ecb ecc ece eck ecl ecn ecu eeb eec eee eek eel een ekb ekc eke ekl eku elb elc ele elk ell eln elu elz en- enb enc ene enk enl enn enu enz eu- eub euc eue eul eun eze ezz k-z kbb kbc kbe kbk kbl kbn kbu kbz kcb kcc kce kck kcl kcn kcu ke- keb kec kee kek kel ken kez kkb kkc kke kkk kkl kkn kku kl- klb klc klu klz kn- knc kne knk knl knn knu kub kuc kue kuk kul kun kuu lbb lbc lbe lbk lbl lbu lcb lcc lce lck lcl lcn lcu leb lec lee lek lel len leu lez lkb lkl llb llc lle llk lll lln llu llz lnb lnc lne lnk lnl lnn lnu lub luc lue luk lul lun luu luz lzu nbb nbc nbe nbk nbl nbn nbu ncb ncc nce nck ncl ncn ncu ne- neb nec nee nek nel nen neu nez nkc nke nkk nkn nku nlb nlc nle nlk nll nln nlu nlz nnb nnc nne nnk nnl nnn nnu nnz nub nuc nue nuk nul nun nuu nzb nze nzz ubb ubc ube ubk ubl ubn ubu ucb ucc uce uck ucl ucn ucu ueb uec uee uel uen ukb ukc uke ukk ukl ukn uku ukz ulb ulc ule ulk ull uln ulu un- unb unc une unk unl unn unu uuc uue uun uuu uzb uzu zbb zbc zbl zce zcl zeb zec zee zek zel zen zez znc zne znn zub zuc zuk zul zun zuz zzz