bbb bbc bbe bbm bbo bbs bcb bcc bce bcm bco bcs be- beb bec bee bem beo bes bmb bmc bme bmm bmo bms bob boc boe bom boo bos bsb bsc bse bsm bso bss c-- cbb cbc cbe cbm cbo cbs ccb ccc cce ccm cco ccs ce- ceb cec cee cem ceo ces cmb cmc cme cmm cmo cms co- cob coc coe com coo cos csb csc cse csm cso css ebb ebc ebe ebm ebo ebs ec- ecb ecc ece ecm eco ecs eeb eec eee eem eeo ees em- emb emc eme emm emo ems eo- eob eoc eoe eom eoo eos es- esb esc ese esm eso ess m-o mbb mbc mbe mbm mbo mbs mc- mcb mcc mce mcm mco mcs meb mec mee mem meo mes mmb mmc mme mmm mmo mms mob moc moe mom moo mos msb msc mse msm mso mss ob- obb obc obe obm obo obs oc- ocb occ ocm oco ocs oeb oec oee oem oeo oes om- omb omc ome omm omo oms oo- oob ooc oom ooo oos os- osb osc ose osm oso oss sbb sbc sbe sbm sbo sbs scb scc sce scm sco scs se- seb sec see sem seo ses smb smc sme smm smo sms sob soc soe som soo sos ss- ssb ssc sse ssm sso sss