-er b-u bbb bbc bbe bbk bbl bbn bbr bbt bbu bcb bcc bce bck bcl bcn bcr bct bcu be- beb bec bee bek bel ben ber bet beu bkb bkc bke bkk bkl bkn bkr bkt blb blc ble blk bll bln blr blt blu bnb bnc bne bnk bnl bnn bnr bnt bnu brb bre brk brl brn brr brt bru btb btc bte btk btl btn btr btt btu bub buc bue buk bul bun bur but buu c-- cbb cbc cbe cbk cbl cbn cbr cbt cbu ccb ccc cce cck ccl ccn ccr cct ccu ce- ceb cec cee cek cel cen cer cet ceu ckb ckc ckt cl- clb clc cle clk cll cln clr clt clu cn- cnb cnc cne cnl cnn cnr cnt cnu crb crc cre crk crl crn crr crt cru ctb ctc cte ctk ctl ctn ctr ctt ctu cub cuc cue cuk cul cun cur cut cuu ebb ebc ebe ebk ebl ebn ebr ebt ebu ec- ecb ecc ece eck ecl ecn ecr ect ecu eeb eec eee eek eel een eer eet ekb ekc eke ekl ekr ekt eku elb elc ele elk ell eln elr elt elu en- enb enc ene enk enl enn enr ent enu erb erc ere erk erl ern err ert eru etb etc ete etk etl etn etr ett etu eu- eub euc eue eul eun eur eut k-t kbb kbc kbe kbk kbl kbn kbr kbu kcb kcc kce kck kcl kcn kcr kct kcu ke- keb kec kee kek kel ken ker ket kkb kkc kke kkk kkl kkn kkr kkt kku kl- klb klc klr klt klu kn- knc kne knk knl knn knr knt knu krc krk krl krn krr krt kru ktb ktc kte ktk ktl ktn ktr ktt ktu kub kuc kue kuk kul kun kur kut kuu lbb lbc lbe lbk lbl lbr lbt lbu lcb lcc lce lck lcl lcn lcr lct lcu leb lec lee lek lel len ler let leu lkb lkl lkr lkt llb llc lle llk lll lln llr llt llu lnb lnc lne lnk lnl lnn lnr lnt lnu lrb lrc lrk lrn lrr lrt lru ltb ltc lte ltk ltl ltr ltt ltu lub luc lue luk lul lun lur lut luu nbb nbc nbe nbk nbl nbn nbr nbt nbu ncb ncc nce nck ncl ncn ncr nct ncu ne- neb nec nee nek nel nen ner net neu nkc nke nkk nkn nkr nkt nku nlb nlc nle nlk nll nln nlr nlt nlu nnb nnc nne nnk nnl nnn nnt nnu nrb nrc nre nrk nrl nrn nrr nrt nru ntb ntc nte ntk ntn ntr ntt ntu nub nuc nue nuk nul nun nur nut nuu rbb rbc rbe rbk rbl rbn rbr rbt rbu rcb rcc rce rcl rcn rcr rct rcu re- reb rec ree rek rel ren rer ret reu rkb rkc rke rkk rkt rku rlc rle rll rln rlr rlt rlu rnb rnc rnn rnr rnt rnu rrb rrc rrk rrl rrn rrr rrt rru rtb rtc rte rtk rtl rtn rtr rtt rtu rub ruc rue ruk run rur rut ruu tbb tbc tbe tbk tbl tbn tbr tbt tbu tcb tcc tce tck tcl tcn tcr tct tcu te- teb tec tee tek tel ten ter tet teu tkb tkc tke tkk tkl tkr tkt tlc tle tlk tll tln tlr tlt tlu tnb tnc tne tnk tnl tnn tnr tnt trb trc tre trk trl trn trr trt tru ttb ttc tte ttk ttl ttn ttr ttt ttu tub tuc tue tuk tul tun tur tut tuu ubb ubc ube ubk ubl ubn ubr ubt ubu ucb ucc uce uck ucl ucn ucr uct ucu ueb uec uee uel uen uer uet ukb ukc uke ukk ukl ukn ukr uku ulb ulc ule ulk ull uln ulr ult ulu un- unb unc une unk unl unn unr unt unu ur- urb urc ure urk url urn urr urt uru utb utc ute utk utl utn utr utt utu uuc uue uun uur uut uuu