-er bbb bbc bbe bbf bbg bbk bbl bbn bbr bcb bcc bce bcf bcg bck bcl bcn bcr be- beb bec bee bef beg bek bel ben ber bfb bfc bfe bff bfg bfl bfn bfr bgb bgc bge bgf bgg bgk bgl bgn bgr bkb bkc bke bkf bkg bkk bkl bkn bkr blb blc ble blf blg blk bll bln blr bnb bnc bne bnf bng bnk bnl bnn bnr brb bre brf brg brk brl brn brr c-- cbb cbc cbe cbf cbg cbk cbl cbn cbr ccb ccc cce ccf ccg cck ccl ccn ccr ce- ceb cec cee cef ceg cek cel cen cer cfb cfc cfe cff cfg cfk cfl cfn cfr cgb cgc cge cgg cgl cgn cgr ckb ckc cl- clb clc cle clf clg clk cll cln clr cn- cnb cnc cne cnf cng cnl cnn cnr crb crc cre crf crg crk crl crn crr ebb ebc ebe ebf ebg ebk ebl ebn ebr ec- ecb ecc ece ecf ecg eck ecl ecn ecr eeb eec eee eef eeg eek eel een eer ef- efb efc efe eff efg efl efr egb egc ege egf egg egl egn egr ekb ekc eke ekf ekg ekl ekr elb elc ele elf elg elk ell eln elr en- enb enc ene enf eng enk enl enn enr erb erc ere erf erg erk erl ern err fbb fbc fbe fbf fbg fbk fbl fbn fbr fcb fcc fce fcf fcg fck fcl fcn fcr feb fec fee fef feg fek fel fen fer ffc ffe fff ffg ffk ffl ffn ffr fgb fgc fge fgf fgg fgl fgn fgr fkb fkc fkf fkg fkk fkl flb flc fle flf flg fll fln flr fnb fnc fne fnf fng fnk fnl fnn fnr frb frc fre frf frg frk frl frn frr gbc gbe gbf gbg gbk gbl gbn gbr gcb gcc gce gcf gcg gck gcl gcn gcr ge- geb gec gee gef geg gek gel gen ger gfb gfc gfe gff gfk gfl gfr ggb ggc ggg ggn ggr gkb gkn glb glc gle glf glg glk gll gln glr gnb gnc gne gnf gnl gnn gnr grb grc gre grf grg grk grl grn grr kbb kbc kbe kbf kbk kbl kbn kbr kcb kcc kce kcg kck kcl kcn kcr ke- keb kec kee kef keg kek kel ken ker kfc kff kfg kgb kgc kgf kgl kkb kkc kke kkk kkl kkn kkr kl- klb klc klf klg klr kn- knc kne knf kng knk knl knn knr krc krf krg krk krl krn krr lbb lbc lbe lbf lbg lbk lbl lbr lcb lcc lce lcf lcg lck lcl lcn lcr leb lec lee lef leg lek lel len ler lfb lfc lfe lff lfg lfk lfl lfn lfr lgb lgc lge lgf lgg lgk lgl lgn lgr lkb lkg lkl lkr llb llc lle llf llg llk lll lln llr lnb lnc lne lng lnk lnl lnn lnr lrb lrc lrf lrg lrk lrn lrr nbb nbc nbe nbf nbg nbk nbl nbn nbr ncb ncc nce ncf ncg nck ncl ncn ncr ne- neb nec nee nef neg nek nel nen ner nfb nfc nfe nff nfk nfl nfn nfr ngb ngc nge ngf ngg ngk ngl ngn nkc nke nkf nkk nkn nkr nlb nlc nle nlf nlg nlk nll nln nlr nnb nnc nne nnf nng nnk nnl nnn nrb nrc nre nrf nrg nrk nrl nrn nrr rbb rbc rbe rbf rbg rbk rbl rbn rbr rcb rcc rce rcf rcg rcl rcn rcr re- reb rec ree ref reg rek rel ren rer rfb rfc rfe rff rfg rfk rfl rfn rfr rgb rgc rge rgf rgg rgk rgn rgr rkb rkc rke rkf rkg rkk rlc rle rlf rlg rll rln rlr rnb rnc rng rnn rnr rrb rrc rrf rrg rrk rrl rrn rrr