-ic bbb bbc bbe bbi bbs bbt bcb bcc bce bci bcs bct be- beb bec bee bei bes bet bi- bib bic bie bii bis bit bsb bsc bse bsi bss bst btb btc bte bti bts btt c-- cbb cbc cbe cbi cbs cbt ccb ccc cce cci ccs cct ce- ceb cec cee cei ces cet ci- cib cic cie cii cis cit csb csc cse csi css cst ctb ctc cte cti cts ctt ebb ebc ebe ebi ebs ebt ec- ecb ecc ece eci ecs ect eeb eec eee ees eet eib eic eie eii eis eit es- esb esc ese esi ess est etb etc ete eti ets ett ibb ibc ibe ibi ibs ibt icb icc ice ici ics ict ie- iec iee iei ies iet iib iic iie iii iis iit is- isb isc ise isi iss ist itb itc ite iti its itt sbb sbc sbe sbi sbs sbt scb scc sce sci scs sct se- seb sec see sei ses set sib sic sie sii sis sit ss- ssb ssc sse ssi sss sst stb stc ste sti sts stt tbb tbc tbe tbi tbs tbt tcb tcc tce tci tcs tct te- teb tec tee tei tes tet tib tic tie tii tis tit tsb tsc tse tsi tss tst ttb ttc tte tti tts ttt