-ic bbb bbc bbe bbi bbo bbs bbt bcb bcc bce bci bco bcs bct be- beb bec bee bei beo bes bet bi- bib bic bie bii bio bis bit bob boc boe boi boo bos bot bsb bsc bse bsi bso bss bst btb btc bte bti bto bts btt c-- cbb cbc cbe cbi cbo cbs cbt ccb ccc cce cci cco ccs cct ce- ceb cec cee cei ceo ces cet ci- cib cic cie cii cio cis cit co- cob coc coe coi coo cos cot csb csc cse csi cso css cst ctb ctc cte cti cto cts ctt ebb ebc ebe ebi ebo ebs ebt ec- ecb ecc ece eci eco ecs ect eeb eec eee eeo ees eet eib eic eie eii eio eis eit eo- eob eoc eoe eoi eoo eos eot es- esb esc ese esi eso ess est etb etc ete eti eto ets ett ibb ibc ibe ibi ibo ibs ibt icb icc ice ici ico ics ict ie- iec iee iei ies iet iib iic iie iii iio iis iit io- iob ioc ioe ioi ioo ios iot is- isb isc ise isi iso iss ist itb itc ite iti ito its itt o-i ob- obb obc obe obi obo obs obt oc- ocb occ oci oco ocs oct oeb oec oee oei oeo oes oet oib oic oie oii oio ois oit oo- oob ooc ooi ooo oos oot os- osb osc ose osi oso oss ost ot- otb otc ote oti oto ots ott sbb sbc sbe sbi sbo sbs sbt scb scc sce sci sco scs sct se- seb sec see sei seo ses set sib sic sie sii sio sis sit sob soc soe soi soo sos sot ss- ssb ssc sse ssi sso sss sst stb stc ste sti sto sts stt tbb tbc tbe tbi tbo tbs tbt tcb tcc tce tci tco tcs tct te- teb tec tee tei teo tes tet tib tic tie tii tio tis tit to- tob toc toe toi too tos tot tsb tsc tse tsi tso tss tst ttb ttc tte tti tto tts ttt