bbb bbc bbe bbm bbo bcb bcc bce bcm bco be- beb bec bee bem beo bmb bmc bme bmm bmo bob boc boe bom boo c-- cbb cbc cbe cbm cbo ccb ccc cce ccm cco ce- ceb cec cee cem ceo cmb cmc cme cmm cmo co- cob coc coe com coo ebb ebc ebe ebm ebo ec- ecb ecc ece ecm eco eeb eec eee eem eeo em- emb emc eme emm emo eo- eob eoc eoe eom eoo m-o mbb mbc mbe mbm mbo mc- mcb mcc mce mcm mco meb mec mee mem meo mmb mmc mme mmm mmo mob moc moe mom moo ob- obb obc obe obm obo oc- ocb occ ocm oco oeb oec oee oem oeo om- omb omc ome omm omo oo- oob ooc oom ooo