-er b-u bbb bbc bbd bbe bbk bbl bbn bbr bbu bcb bcc bcd bce bck bcl bcn bcr bcu bdb bdc bdd bde bdk bdl bdr bdu be- beb bec bed bee bek bel ben ber beu bkb bkc bke bkk bkl bkn bkr blb blc bld ble blk bll bln blr blu bnb bnc bnd bne bnk bnl bnn bnr bnu brb brd bre brk brl brn brr bru bub buc bud bue buk bul bun bur buu c-- cbb cbc cbd cbe cbk cbl cbn cbr cbu ccb ccc ccd cce cck ccl ccn ccr ccu cdb cdc cdd cde cdk cdl cdn cdr cdu ce- ceb cec ced cee cek cel cen cer ceu ckb ckc ckd cl- clb clc cld cle clk cll cln clr clu cn- cnb cnc cnd cne cnl cnn cnr cnu crb crc crd cre crk crl crn crr cru cub cuc cud cue cuk cul cun cur cuu dbb dbc dbd dbe dbk dbl dbn dbr dbu dcb dcc dcd dce dck dcl dcn dcr dcu ddb ddc ddd dde ddk ddl ddn ddr ddu de- deb dec ded dee dek del den der deu dkb dkc dke dkk dkl dkr dku dl- dlb dlc dld dle dlk dll dlr dlu dnb dnc dnd dne dnk dnl dnn dnr drb drc drd dre drk drl drn drr dru dub duc dud due duk dul dun dur ebb ebc ebd ebe ebk ebl ebn ebr ebu ec- ecb ecc ecd ece eck ecl ecn ecr ecu ed- edb edc edd ede edk edl edn edr edu eeb eec eed eee eek eel een eer ekb ekc ekd eke ekl ekr eku elb elc eld ele elk ell eln elr elu en- enb enc end ene enk enl enn enr enu erb erc erd ere erk erl ern err eru eu- eub euc eud eue eul eun eur kbb kbc kbd kbe kbk kbl kbn kbr kbu kcb kcc kcd kce kck kcl kcn kcr kcu kdb kdc kde kdk kdl kdr kdu ke- keb kec ked kee kek kel ken ker kkb kkc kke kkk kkl kkn kkr kku kl- klb klc kld klr klu kn- knc knd kne knk knl knn knr knu krc krd krk krl krn krr kru kub kuc kud kue kuk kul kun kur kuu lbb lbc lbd lbe lbk lbl lbr lbu lcb lcc lcd lce lck lcl lcn lcr lcu ldb ldc ldd lde ldk ldl ldn ldr ldu leb lec led lee lek lel len ler leu lkb lkl lkr llb llc lld lle llk lll lln llr llu lnb lnc lnd lne lnk lnl lnn lnr lnu lrb lrc lrd lrk lrn lrr lru lub luc lud lue luk lul lun lur luu nbb nbc nbd nbe nbk nbl nbn nbr nbu ncb ncc ncd nce nck ncl ncn ncr ncu ndb ndc ndd nde ndk ndl ndn ndr ndu ne- neb nec ned nee nek nel nen ner neu nkc nke nkk nkn nkr nku nlb nlc nld nle nlk nll nln nlr nlu nnb nnc nne nnk nnl nnn nnu nrb nrc nrd nre nrk nrl nrn nrr nru nub nuc nud nue nuk nul nun nur nuu rbb rbc rbd rbe rbk rbl rbn rbr rbu rcb rcc rcd rce rcl rcn rcr rcu rdb rdc rdd rde rdl rdn rdr rdu re- reb rec red ree rek rel ren rer reu rkb rkc rke rkk rku rlc rld rle rll rln rlr rlu rnb rnc rnd rnn rnr rnu rrb rrc rrd rrk rrl rrn rrr rru rub ruc rud rue ruk run rur ruu ubb ubc ube ubk ubl ubn ubr ubu ucb ucc ucd uce uck ucl ucn ucr ucu udb udc udd ude udk udl udn udr udu ueb uec ued uee uel uen uer ukb ukc uke ukk ukl ukn ukr uku ulb ulc uld ule ulk ull uln ulr ulu un- unb unc und une unk unl unn unr unu ur- urb urc urd ure urk url urn urr uru uuc uue uun uur uuu