-er b-u bbb bbc bbe bbk bbn bbr bbt bbu bcb bcc bce bck bcn bcr bct bcu be- beb bec bee bek ben ber bet beu bkb bkc bke bkk bkn bkr bkt bnb bnc bne bnk bnn bnr bnt bnu brb bre brk brn brr brt bru btb btc bte btk btn btr btt btu bub buc bue buk bun bur but buu c-- cbb cbc cbe cbk cbn cbr cbt cbu ccb ccc cce cck ccn ccr cct ccu ce- ceb cec cee cek cen cer cet ceu ckb ckc ckt cn- cnb cnc cne cnn cnr cnt cnu crb crc cre crk crn crr crt cru ctb ctc cte ctk ctn ctr ctt ctu cub cuc cue cuk cun cur cut cuu ebb ebc ebe ebk ebn ebr ebt ebu ec- ecb ecc ece eck ecn ecr ect ecu eeb eec eee eek een eer eet ekb ekc eke ekr ekt eku en- enb enc ene enk enn enr ent enu erb erc ere erk ern err ert eru etb etc ete etk etn etr ett etu eu- eub euc eue eun eur eut k-t kbb kbc kbe kbk kbn kbr kbu kcb kcc kce kck kcn kcr kct kcu ke- keb kec kee kek ken ker ket kkb kkc kke kkk kkn kkr kkt kku kn- knc kne knk knn knr knt knu krc krk krn krr krt kru ktb ktc kte ktk ktn ktr ktt ktu kub kuc kue kuk kun kur kut kuu nbb nbc nbe nbk nbn nbr nbt nbu ncb ncc nce nck ncn ncr nct ncu ne- neb nec nee nek nen ner net neu nkc nke nkk nkn nkr nkt nku nnb nnc nne nnk nnn nnt nnu nrb nrc nre nrk nrn nrr nrt nru ntb ntc nte ntk ntn ntr ntt ntu nub nuc nue nuk nun nur nut nuu rbb rbc rbe rbk rbn rbr rbt rbu rcb rcc rce rcn rcr rct rcu re- reb rec ree rek ren rer ret reu rkb rkc rke rkk rkt rku rnb rnc rnn rnr rnt rnu rrb rrc rrk rrn rrr rrt rru rtb rtc rte rtk rtn rtr rtt rtu rub ruc rue ruk run rur rut ruu tbb tbc tbe tbk tbn tbr tbt tbu tcb tcc tce tck tcn tcr tct tcu te- teb tec tee tek ten ter tet teu tkb tkc tke tkk tkr tkt tnb tnc tne tnk tnn tnr tnt trb trc tre trk trn trr trt tru ttb ttc tte ttk ttn ttr ttt ttu tub tuc tue tuk tun tur tut tuu ubb ubc ube ubk ubn ubr ubt ubu ucb ucc uce uck ucn ucr uct ucu ueb uec uee uen uer uet ukb ukc uke ukk ukn ukr uku un- unb unc une unk unn unr unt unu ur- urb urc ure urk urn urr urt uru utb utc ute utk utn utr utt utu uuc uue uun uur uut uuu