b-u bbb bbc bbe bbk bbn bbs bbt bbu bcb bcc bce bck bcn bcs bct bcu be- beb bec bee bek ben bes bet beu bkb bkc bke bkk bkn bks bkt bnb bnc bne bnk bnn bns bnt bnu bsb bsc bse bsk bsn bss bst bsu btb btc bte btk btn bts btt btu bub buc bue buk bun bus but buu c-- cbb cbc cbe cbk cbn cbs cbt cbu ccb ccc cce cck ccn ccs cct ccu ce- ceb cec cee cek cen ces cet ceu ckb ckc cks ckt cn- cnb cnc cne cnn cns cnt cnu csb csc cse csk csn css cst csu ctb ctc cte ctk ctn cts ctt ctu cub cuc cue cuk cun cus cut cuu ebb ebc ebe ebk ebn ebs ebt ebu ec- ecb ecc ece eck ecn ecs ect ecu eeb eec eee eek een ees eet ekb ekc eke eks ekt eku en- enb enc ene enk enn ens ent enu es- esb esc ese esk esn ess est esu etb etc ete etk etn ets ett etu eu- eub euc eue eun eus eut k-t kbb kbc kbe kbk kbn kbs kbu kcb kcc kce kck kcn kcs kct kcu ke- keb kec kee kek ken kes ket kkb kkc kke kkk kkn kks kkt kku kn- knc kne knk knn knt knu ksb ksc kse ksk ksn kss kst ksu ktb ktc kte ktk ktn kts ktt ktu kub kuc kue kuk kun kus kut kuu nbb nbc nbe nbk nbn nbs nbt nbu ncb ncc nce nck ncn ncs nct ncu ne- neb nec nee nek nen nes net neu nkc nke nkk nkn nks nkt nku nnb nnc nne nnk nnn nns nnt nnu nsb nsc nse nsk nsn nss nst nsu ntb ntc nte ntk ntn nts ntt ntu nub nuc nue nuk nun nus nut nuu sbb sbc sbe sbk sbn sbs sbt sbu scb scc sce sck scn scs sct scu se- seb sec see sek sen ses set seu sk- skb skc ske skk sks skt sku snb snc sne snk snn sns snt snu ss- ssb ssc sse ssk ssn sss sst ssu stb stc ste stk stn sts stt stu sub suc sue suk sun sus sut suu tbb tbc tbe tbk tbn tbs tbt tbu tcb tcc tce tck tcn tcs tct tcu te- teb tec tee tek ten tes tet teu tkb tkc tke tkk tks tkt tnb tnc tne tnk tnn tns tnt tsb tsc tse tsk tsn tss tst tsu ttb ttc tte ttk ttn tts ttt ttu tub tuc tue tuk tun tus tut tuu ubb ubc ube ubk ubn ubs ubt ubu ucb ucc uce uck ucn ucs uct ucu ueb uec uee uen ues uet ukb ukc uke ukk ukn uku un- unb unc une unk unn uns unt unu usb usc use usk usn uss ust usu utb utc ute utk utn uts utt utu uuc uue uun uus uut uuu