-ic bbb bbc bbe bbi bbm bbo bbs bcb bcc bce bci bcm bco bcs be- beb bec bee bei bem beo bes bi- bib bic bie bii bim bio bis bmb bmc bme bmi bmm bmo bms bob boc boe boi bom boo bos bsb bsc bse bsi bsm bso bss c-- cbb cbc cbe cbi cbm cbo cbs ccb ccc cce cci ccm cco ccs ce- ceb cec cee cei cem ceo ces ci- cib cic cie cii cim cio cis cmb cmc cme cmi cmm cmo cms co- cob coc coe coi com coo cos csb csc cse csi csm cso css ebb ebc ebe ebi ebm ebo ebs ec- ecb ecc ece eci ecm eco ecs eeb eec eee eem eeo ees eib eic eie eii eim eio eis em- emb emc eme emi emm emo ems eo- eob eoc eoe eoi eom eoo eos es- esb esc ese esi esm eso ess ibb ibc ibe ibi ibm ibo ibs icb icc ice ici icm ico ics ie- iec iee iei iem ies iib iic iie iii iim iio iis im- imb imc ime imi imm imo ims io- iob ioc ioe ioi iom ioo ios is- isb isc ise isi ism iso iss m-o mbb mbc mbe mbi mbm mbo mbs mc- mcb mcc mce mci mcm mco mcs meb mec mee mei mem meo mes mi- mib mic mie mii mim mio mis mmb mmc mme mmi mmm mmo mms mob moc moe moi mom moo mos msb msc mse msi msm mso mss o-i ob- obb obc obe obi obm obo obs oc- ocb occ oci ocm oco ocs oeb oec oee oei oem oeo oes oib oic oie oii oim oio ois om- omb omc ome omi omm omo oms oo- oob ooc ooi oom ooo oos os- osb osc ose osi osm oso oss sbb sbc sbe sbi sbm sbo sbs scb scc sce sci scm sco scs se- seb sec see sei sem seo ses sib sic sie sii sim sio sis smb smc sme smi smm smo sms sob soc soe soi som soo sos ss- ssb ssc sse ssi ssm sso sss