b-u bbb bbc bbe bbk bbs bbt bbu bcb bcc bce bck bcs bct bcu be- beb bec bee bek bes bet beu bkb bkc bke bkk bks bkt bsb bsc bse bsk bss bst bsu btb btc bte btk bts btt btu bub buc bue buk bus but buu c-- cbb cbc cbe cbk cbs cbt cbu ccb ccc cce cck ccs cct ccu ce- ceb cec cee cek ces cet ceu ckb ckc cks ckt csb csc cse csk css cst csu ctb ctc cte ctk cts ctt ctu cub cuc cue cuk cus cut cuu ebb ebc ebe ebk ebs ebt ebu ec- ecb ecc ece eck ecs ect ecu eeb eec eee eek ees eet ekb ekc eke eks ekt eku es- esb esc ese esk ess est esu etb etc ete etk ets ett etu eu- eub euc eue eus eut k-t kbb kbc kbe kbk kbs kbu kcb kcc kce kck kcs kct kcu ke- keb kec kee kek kes ket kkb kkc kke kkk kks kkt kku ksb ksc kse ksk kss kst ksu ktb ktc kte ktk kts ktt ktu kub kuc kue kuk kus kut kuu sbb sbc sbe sbk sbs sbt sbu scb scc sce sck scs sct scu se- seb sec see sek ses set seu sk- skb skc ske skk sks skt sku ss- ssb ssc sse ssk sss sst ssu stb stc ste stk sts stt stu sub suc sue suk sus sut suu tbb tbc tbe tbk tbs tbt tbu tcb tcc tce tck tcs tct tcu te- teb tec tee tek tes tet teu tkb tkc tke tkk tks tkt tsb tsc tse tsk tss tst tsu ttb ttc tte ttk tts ttt ttu tub tuc tue tuk tus tut tuu ubb ubc ube ubk ubs ubt ubu ucb ucc uce uck ucs uct ucu ueb uec uee ues uet ukb ukc uke ukk uku usb usc use usk uss ust usu utb utc ute utk uts utt utu uuc uue uus uut uuu