-ic bbb bbc bbe bbi bbm bbo bbs bbt bcb bcc bce bci bcm bco bcs bct be- beb bec bee bei bem beo bes bet bi- bib bic bie bii bim bio bis bit bmb bmc bme bmi bmm bmo bms bmt bob boc boe boi bom boo bos bot bsb bsc bse bsi bsm bso bss bst btb btc bte bti btm bto bts btt c-- cbb cbc cbe cbi cbm cbo cbs cbt ccb ccc cce cci ccm cco ccs cct ce- ceb cec cee cei cem ceo ces cet ci- cib cic cie cii cim cio cis cit cmb cmc cme cmi cmm cmo cms cmt co- cob coc coe coi com coo cos cot csb csc cse csi csm cso css cst ctb ctc cte cti ctm cto cts ctt ebb ebc ebe ebi ebm ebo ebs ebt ec- ecb ecc ece eci ecm eco ecs ect eeb eec eee eem eeo ees eet eib eic eie eii eim eio eis eit em- emb emc eme emi emm emo ems emt eo- eob eoc eoe eoi eom eoo eos eot es- esb esc ese esi esm eso ess est etb etc ete eti etm eto ets ett ibb ibc ibe ibi ibm ibo ibs ibt icb icc ice ici icm ico ics ict ie- iec iee iei iem ies iet iib iic iie iii iim iio iis iit im- imb imc ime imi imm imo ims imt io- iob ioc ioe ioi iom ioo ios iot is- isb isc ise isi ism iso iss ist itb itc ite iti itm ito its itt m-o mbb mbc mbe mbi mbm mbo mbs mbt mc- mcb mcc mce mci mcm mco mcs mct meb mec mee mei mem meo mes met mi- mib mic mie mii mim mio mis mit mmb mmc mme mmi mmm mmo mms mmt mob moc moe moi mom moo mos mot msb msc mse msi msm mso mss mst mtb mtc mte mti mtm mto mts mtt o-i ob- obb obc obe obi obm obo obs obt oc- ocb occ oci ocm oco ocs oct oeb oec oee oei oem oeo oes oet oib oic oie oii oim oio ois oit om- omb omc ome omi omm omo oms omt oo- oob ooc ooi oom ooo oos oot os- osb osc ose osi osm oso oss ost ot- otb otc ote oti otm oto ots ott sbb sbc sbe sbi sbm sbo sbs sbt scb scc sce sci scm sco scs sct se- seb sec see sei sem seo ses set sib sic sie sii sim sio sis sit smb smc sme smi smm smo sms smt sob soc soe soi som soo sos sot ss- ssb ssc sse ssi ssm sso sss sst stb stc ste sti stm sto sts stt tbb tbc tbe tbi tbm tbo tbs tbt tcb tcc tce tci tcm tco tcs tct te- teb tec tee tei tem teo tes tet tib tic tie tii tim tio tis tit tmb tmc tme tmi tmm tmo tms tmt to- tob toc toe toi tom too tos tot tsb tsc tse tsi tsm tso tss tst ttb ttc tte tti ttm tto tts ttt