bbb bbc bbe bbk bbn bbs bbt bcb bcc bce bck bcn bcs bct be- beb bec bee bek ben bes bet bkb bkc bke bkk bkn bks bkt bnb bnc bne bnk bnn bns bnt bsb bsc bse bsk bsn bss bst btb btc bte btk btn bts btt c-- cbb cbc cbe cbk cbn cbs cbt ccb ccc cce cck ccn ccs cct ce- ceb cec cee cek cen ces cet ckb ckc cks ckt cn- cnb cnc cne cnn cns cnt csb csc cse csk csn css cst ctb ctc cte ctk ctn cts ctt ebb ebc ebe ebk ebn ebs ebt ec- ecb ecc ece eck ecn ecs ect eeb eec eee eek een ees eet ekb ekc eke eks ekt en- enb enc ene enk enn ens ent es- esb esc ese esk esn ess est etb etc ete etk etn ets ett k-t kbb kbc kbe kbk kbn kbs kcb kcc kce kck kcn kcs kct ke- keb kec kee kek ken kes ket kkb kkc kke kkk kkn kks kkt kn- knc kne knk knn knt ksb ksc kse ksk ksn kss kst ktb ktc kte ktk ktn kts ktt nbb nbc nbe nbk nbn nbs nbt ncb ncc nce nck ncn ncs nct ne- neb nec nee nek nen nes net nkc nke nkk nkn nks nkt nnb nnc nne nnk nnn nns nnt nsb nsc nse nsk nsn nss nst ntb ntc nte ntk ntn nts ntt sbb sbc sbe sbk sbn sbs sbt scb scc sce sck scn scs sct se- seb sec see sek sen ses set sk- skb skc ske skk sks skt snb snc sne snk snn sns snt ss- ssb ssc sse ssk ssn sss sst stb stc ste stk stn sts stt tbb tbc tbe tbk tbn tbs tbt tcb tcc tce tck tcn tcs tct te- teb tec tee tek ten tes tet tkb tkc tke tkk tks tkt tnb tnc tne tnk tnn tns tnt tsb tsc tse tsk tsn tss tst ttb ttc tte ttk ttn tts ttt