-er b-u bbb bbc bbd bbe bbm bbn bbr bbu bcb bcc bcd bce bcm bcn bcr bcu bdb bdc bdd bde bdm bdr bdu be- beb bec bed bee bem ben ber beu bmb bmc bmd bme bmm bmn bmr bmu bnb bnc bnd bne bnn bnr bnu brb brd bre brm brn brr bru bub buc bud bue bum bun bur buu c-- cbb cbc cbd cbe cbm cbn cbr cbu ccb ccc ccd cce ccm ccn ccr ccu cdb cdc cdd cde cdm cdn cdr cdu ce- ceb cec ced cee cem cen cer ceu cmb cmc cmd cme cmm cmn cmr cmu cn- cnb cnc cnd cne cnm cnn cnr cnu crb crc crd cre crm crn crr cru cub cuc cud cue cum cun cur cuu dbb dbc dbd dbe dbm dbn dbr dbu dcb dcc dcd dce dcm dcn dcr dcu ddb ddc ddd dde ddm ddn ddr ddu de- deb dec ded dee dem den der deu dmb dmc dmd dme dmm dmn dmr dmu dnb dnc dnd dne dnm dnn dnr drb drc drd dre drm drn drr dru dub duc dud due dum dun dur ebb ebc ebd ebe ebm ebn ebr ebu ec- ecb ecc ecd ece ecm ecn ecr ecu ed- edb edc edd ede edm edn edr edu eeb eec eed eee eem een eer em- emb emc emd eme emm emn emr emu en- enb enc end ene enm enn enr enu erb erc erd ere erm ern err eru eu- eub euc eud eue eun eur m-r mbb mbc mbd mbe mbm mbr mbu mc- mcb mcc mcd mce mcm mcn mcr mcu mdb mdc mdd mde mdm mdn mdr mdu meb mec med mee mem men mer meu mmb mmc mmd mme mmm mmn mmr mmu mnb mnc mne mnm mnn mnr mnu mrb mrc mrd mre mrm mrn mrr mru mub muc mud mue mum mun mur muu nbb nbc nbd nbe nbm nbn nbr nbu ncb ncc ncd nce ncm ncn ncr ncu ndb ndc ndd nde ndm ndn ndr ndu ne- neb nec ned nee nem nen ner neu nmb nmc nmd nme nmm nmn nmr nmu nnb nnc nne nnm nnn nnu nrb nrc nrd nre nrm nrn nrr nru nub nuc nud nue num nun nur nuu rbb rbc rbd rbe rbm rbn rbr rbu rcb rcc rcd rce rcm rcn rcr rcu rdb rdc rdd rde rdm rdn rdr rdu re- reb rec red ree rem ren rer reu rmb rmc rmd rme rmm rmn rmr rnb rnc rnd rnm rnn rnr rnu rrb rrc rrd rrm rrn rrr rru rub ruc rud rue rum run rur ruu ubb ubc ube ubn ubr ubu ucb ucc ucd uce ucm ucn ucr ucu udb udc udd ude udm udn udr udu ueb uec ued uee uem uen uer um- umb umc umd ume umm umn umr umu un- unb unc und une unm unn unr unu ur- urb urc urd ure urm urn urr uru uuc uue uum uun uur uuu