-er b-u bbb bbc bbe bbm bbn bbr bbt bbu bcb bcc bce bcm bcn bcr bct bcu be- beb bec bee bem ben ber bet beu bmb bmc bme bmm bmn bmr bmt bmu bnb bnc bne bnn bnr bnt bnu brb bre brm brn brr brt bru btb btc bte btm btn btr btt btu bub buc bue bum bun bur but buu c-- cbb cbc cbe cbm cbn cbr cbt cbu ccb ccc cce ccm ccn ccr cct ccu ce- ceb cec cee cem cen cer cet ceu cmb cmc cme cmm cmn cmr cmt cmu cn- cnb cnc cne cnm cnn cnr cnt cnu crb crc cre crm crn crr crt cru ctb ctc cte ctm ctn ctr ctt ctu cub cuc cue cum cun cur cut cuu ebb ebc ebe ebm ebn ebr ebt ebu ec- ecb ecc ece ecm ecn ecr ect ecu eeb eec eee eem een eer eet em- emb emc eme emm emn emr emt emu en- enb enc ene enm enn enr ent enu erb erc ere erm ern err ert eru etb etc ete etm etn etr ett etu eu- eub euc eue eun eur eut m-r mbb mbc mbe mbm mbr mbt mbu mc- mcb mcc mce mcm mcn mcr mct mcu meb mec mee mem men mer met meu mmb mmc mme mmm mmn mmr mmt mmu mnb mnc mne mnm mnn mnr mnt mnu mrb mrc mre mrm mrn mrr mrt mru mtb mtc mte mtm mtn mtr mtt mtu mub muc mue mum mun mur mut muu nbb nbc nbe nbm nbn nbr nbt nbu ncb ncc nce ncm ncn ncr nct ncu ne- neb nec nee nem nen ner net neu nmb nmc nme nmm nmn nmr nmt nmu nnb nnc nne nnm nnn nnt nnu nrb nrc nre nrm nrn nrr nrt nru ntb ntc nte ntm ntn ntr ntt ntu nub nuc nue num nun nur nut nuu rbb rbc rbe rbm rbn rbr rbt rbu rcb rcc rce rcm rcn rcr rct rcu re- reb rec ree rem ren rer ret reu rmb rmc rme rmm rmn rmr rmt rnb rnc rnm rnn rnr rnt rnu rrb rrc rrm rrn rrr rrt rru rtb rtc rte rtm rtn rtr rtt rtu rub ruc rue rum run rur rut ruu tbb tbc tbe tbm tbn tbr tbt tbu tcb tcc tce tcm tcn tcr tct tcu te- teb tec tee tem ten ter tet teu tmb tmc tme tmm tmn tmr tmt tmu tnb tnc tne tnm tnn tnr tnt trb trc tre trm trn trr trt tru ttb ttc tte ttm ttn ttr ttt ttu tub tuc tue tum tun tur tut tuu ubb ubc ube ubn ubr ubt ubu ucb ucc uce ucm ucn ucr uct ucu ueb uec uee uem uen uer uet um- umb umc ume umm umn umr umt umu un- unb unc une unm unn unr unt unu ur- urb urc ure urm urn urr urt uru utb utc ute utm utn utr utt utu uuc uue uum uun uur uut uuu