-er b-u bbb bbe bbk bbn bbr bbt bbu be- beb bee bek ben ber bet beu bkb bke bkk bkn bkr bkt bnb bne bnk bnn bnr bnt bnu brb bre brk brn brr brt bru btb bte btk btn btr btt btu bub bue buk bun bur but buu ebb ebe ebk ebn ebr ebt ebu eeb eee eek een eer eet ekb eke ekr ekt eku en- enb ene enk enn enr ent enu erb ere erk ern err ert eru etb ete etk etn etr ett etu eu- eub eue eun eur eut k-t kbb kbe kbk kbn kbr kbu ke- keb kee kek ken ker ket kkb kke kkk kkn kkr kkt kku kn- kne knk knn knr knt knu krk krn krr krt kru ktb kte ktk ktn ktr ktt ktu kub kue kuk kun kur kut kuu nbb nbe nbk nbn nbr nbt nbu ne- neb nee nek nen ner net neu nke nkk nkn nkr nkt nku nnb nne nnk nnn nnt nnu nrb nre nrk nrn nrr nrt nru ntb nte ntk ntn ntr ntt ntu nub nue nuk nun nur nut nuu rbb rbe rbk rbn rbr rbt rbu re- reb ree rek ren rer ret reu rkb rke rkk rkt rku rnb rnn rnr rnt rnu rrb rrk rrn rrr rrt rru rtb rte rtk rtn rtr rtt rtu rub rue ruk run rur rut ruu tbb tbe tbk tbn tbr tbt tbu te- teb tee tek ten ter tet teu tkb tke tkk tkr tkt tnb tne tnk tnn tnr tnt trb tre trk trn trr trt tru ttb tte ttk ttn ttr ttt ttu tub tue tuk tun tur tut tuu ubb ube ubk ubn ubr ubt ubu ueb uee uen uer uet ukb uke ukk ukn ukr uku un- unb une unk unn unr unt unu ur- urb ure urk urn urr urt uru utb ute utk utn utr utt utu uue uun uur uut uuu