-ic bbb bbc bbe bbi bbk bbs bbt bcb bcc bce bci bck bcs bct be- beb bec bee bei bek bes bet bi- bib bic bie bii bik bis bit bkb bkc bke bkk bks bkt bsb bsc bse bsi bsk bss bst btb btc bte bti btk bts btt c-- cbb cbc cbe cbi cbk cbs cbt ccb ccc cce cci cck ccs cct ce- ceb cec cee cei cek ces cet ci- cib cic cie cii cik cis cit ckb ckc cki cks ckt csb csc cse csi csk css cst ctb ctc cte cti ctk cts ctt ebb ebc ebe ebi ebk ebs ebt ec- ecb ecc ece eci eck ecs ect eeb eec eee eek ees eet eib eic eie eii eik eis eit ekb ekc eke eki eks ekt es- esb esc ese esi esk ess est etb etc ete eti etk ets ett ibb ibc ibe ibi ibk ibs ibt icb icc ice ici ick ics ict ie- iec iee iei iek ies iet iib iic iie iii iis iit ikb ikc ike iki ikk iks ikt is- isb isc ise isi isk iss ist itb itc ite iti itk its itt k-t kbb kbc kbe kbi kbk kbs kcb kcc kce kci kck kcs kct ke- keb kec kee kei kek kes ket kib kic kie kii kik kis kit kkb kkc kke kki kkk kks kkt ksb ksc kse ksi ksk kss kst ktb ktc kte ktk kts ktt sbb sbc sbe sbi sbk sbs sbt scb scc sce sci sck scs sct se- seb sec see sei sek ses set sib sic sie sii sik sis sit sk- skb skc ske ski skk sks skt ss- ssb ssc sse ssi ssk sss sst stb stc ste sti stk sts stt tbb tbc tbe tbi tbk tbs tbt tcb tcc tce tci tck tcs tct te- teb tec tee tei tek tes tet tib tic tie tii tik tis tit tkb tkc tke tkk tks tkt tsb tsc tse tsi tsk tss tst ttb ttc tte tti ttk tts ttt