-er b-u bbb bbc bbe bbm bbn bbr bbu bcb bcc bce bcm bcn bcr bcu be- beb bec bee bem ben ber beu bmb bmc bme bmm bmn bmr bmu bnb bnc bne bnn bnr bnu brb bre brm brn brr bru bub buc bue bum bun bur buu c-- cbb cbc cbe cbm cbn cbr cbu ccb ccc cce ccm ccn ccr ccu ce- ceb cec cee cem cen cer ceu cmb cmc cme cmm cmn cmr cmu cn- cnb cnc cne cnm cnn cnr cnu crb crc cre crm crn crr cru cub cuc cue cum cun cur cuu ebb ebc ebe ebm ebn ebr ebu ec- ecb ecc ece ecm ecn ecr ecu eeb eec eee eem een eer em- emb emc eme emm emn emr emu en- enb enc ene enm enn enr enu erb erc ere erm ern err eru eu- eub euc eue eun eur m-r mbb mbc mbe mbm mbr mbu mc- mcb mcc mce mcm mcn mcr mcu meb mec mee mem men mer meu mmb mmc mme mmm mmn mmr mmu mnb mnc mne mnm mnn mnr mnu mrb mrc mre mrm mrn mrr mru mub muc mue mum mun mur muu nbb nbc nbe nbm nbn nbr nbu ncb ncc nce ncm ncn ncr ncu ne- neb nec nee nem nen ner neu nmb nmc nme nmm nmn nmr nmu nnb nnc nne nnm nnn nnu nrb nrc nre nrm nrn nrr nru nub nuc nue num nun nur nuu rbb rbc rbe rbm rbn rbr rbu rcb rcc rce rcm rcn rcr rcu re- reb rec ree rem ren rer reu rmb rmc rme rmm rmn rmr rnb rnc rnm rnn rnr rnu rrb rrc rrm rrn rrr rru rub ruc rue rum run rur ruu ubb ubc ube ubn ubr ubu ucb ucc uce ucm ucn ucr ucu ueb uec uee uem uen uer um- umb umc ume umm umn umr umu un- unb unc une unm unn unr unu ur- urb urc ure urm urn urr uru uuc uue uum uun uur uuu