-er bbb bbc bbe bbh bbm bbo bbr bcb bcc bce bch bcm bco bcr be- beb bec bee beh bem beo ber bhb bhc bhe bhh bhm bho bhr bmb bmc bme bmh bmm bmo bmr bob boc boe boh bom boo bor brb bre brh brm bro brr c-- cbb cbc cbe cbh cbm cbo cbr ccb ccc cce cch ccm cco ccr ce- ceb cec cee ceh cem ceo cer ch- chb chc che chh chm cho chr cmb cmc cme cmh cmm cmo cmr co- cob coc coe coh com coo cor crb crc cre crh crm cro crr ebb ebc ebe ebh ebm ebo ebr ec- ecb ecc ece ech ecm eco ecr eeb eec eee eem eeo eer ehb ehc ehe ehh ehm eho ehr em- emb emc eme emh emm emo emr eo- eob eoc eoe eoh eom eoo eor erb erc ere erh erm ero err hbb hbc hbe hbh hbm hbo hbr hcb hcc hce hch hcm hco hcr he- heb hec hee heh hem heo her hhb hhc hhe hhh hhm hho hhr hmb hmc hme hmh hmm hmo hmr hob hoc hoe hoh hom hoo hor hr- hrb hrc hre hrh hrm hro hrr m-o m-r mbb mbc mbe mbh mbm mbo mbr mc- mcb mcc mce mch mcm mco mcr meb mec mee meh mem meo mer mhc mhh mhm mho mhr mmb mmc mme mmh mmm mmo mmr mob moc moe moh mom moo mor mrb mrc mre mrh mrm mro mrr ob- obb obc obe obh obm obo obr oc- ocb occ och ocm oco ocr oeb oec oee oeh oem oeo oer ohc ohe ohh ohm oho ohr om- omb omc ome omh omm omo omr oo- oob ooc ooh oom ooo oor or- orb orc ore orh orm oro orr rbb rbc rbe rbh rbm rbo rbr rcb rcc rce rch rcm rco rcr re- reb rec ree reh rem reo rer rh- rhb rhc rhe rhh rhm rho rhr rmb rmc rme rmh rmm rmo rmr rob roc roe roh rom roo ror rrb rrc rrh rrm rrr