b-u bbb bbc bbe bbm bbn bbs bbt bbu bcb bcc bce bcm bcn bcs bct bcu be- beb bec bee bem ben bes bet beu bmb bmc bme bmm bmn bms bmt bmu bnb bnc bne bnn bns bnt bnu bsb bsc bse bsm bsn bss bst bsu btb btc bte btm btn bts btt btu bub buc bue bum bun bus but buu c-- cbb cbc cbe cbm cbn cbs cbt cbu ccb ccc cce ccm ccn ccs cct ccu ce- ceb cec cee cem cen ces cet ceu cmb cmc cme cmm cmn cms cmt cmu cn- cnb cnc cne cnm cnn cns cnt cnu csb csc cse csm csn css cst csu ctb ctc cte ctm ctn cts ctt ctu cub cuc cue cum cun cus cut cuu ebb ebc ebe ebm ebn ebs ebt ebu ec- ecb ecc ece ecm ecn ecs ect ecu eeb eec eee eem een ees eet em- emb emc eme emm emn ems emt emu en- enb enc ene enm enn ens ent enu es- esb esc ese esm esn ess est esu etb etc ete etm etn ets ett etu eu- eub euc eue eun eus eut mbb mbc mbe mbm mbs mbt mbu mc- mcb mcc mce mcm mcn mcs mct mcu meb mec mee mem men mes met meu mmb mmc mme mmm mmn mms mmt mmu mnb mnc mne mnm mnn mns mnt mnu msb msc mse msm msn mss mst msu mtb mtc mte mtm mtn mts mtt mtu mub muc mue mum mun mus mut muu nbb nbc nbe nbm nbn nbs nbt nbu ncb ncc nce ncm ncn ncs nct ncu ne- neb nec nee nem nen nes net neu nmb nmc nme nmm nmn nms nmt nmu nnb nnc nne nnm nnn nns nnt nnu nsb nsc nse nsm nsn nss nst nsu ntb ntc nte ntm ntn nts ntt ntu nub nuc nue num nun nus nut nuu sbb sbc sbe sbm sbn sbs sbt sbu scb scc sce scm scn scs sct scu se- seb sec see sem sen ses set seu smb smc sme smm smn sms smt smu snb snc sne snm snn sns snt snu ss- ssb ssc sse ssm ssn sss sst ssu stb stc ste stm stn sts stt stu sub suc sue sum sun sus sut suu tbb tbc tbe tbm tbn tbs tbt tbu tcb tcc tce tcm tcn tcs tct tcu te- teb tec tee tem ten tes tet teu tmb tmc tme tmm tmn tms tmt tmu tnb tnc tne tnm tnn tns tnt tsb tsc tse tsm tsn tss tst tsu ttb ttc tte ttm ttn tts ttt ttu tub tuc tue tum tun tus tut tuu ubb ubc ube ubn ubs ubt ubu ucb ucc uce ucm ucn ucs uct ucu ueb uec uee uem uen ues uet um- umb umc ume umm umn ums umt umu un- unb unc une unm unn uns unt unu usb usc use usm usn uss ust usu utb utc ute utm utn uts utt utu uuc uue uum uun uus uut uuu