-er bbb bbc bbe bbh bbm bbo bbr bbx bcb bcc bce bch bcm bco bcr bcx be- beb bec bee beh bem beo ber bex bhb bhc bhe bhh bhm bho bhr bhx bmb bmc bme bmh bmm bmo bmr bmx bob boc boe boh bom boo bor box brb bre brh brm bro brr brx bxb bxm bxo bxx c-- cbb cbc cbe cbh cbm cbo cbr cbx ccb ccc cce cch ccm cco ccr ccx ce- ceb cec cee ceh cem ceo cer cex ch- chb chc che chh chm cho chr chx cmb cmc cme cmh cmm cmo cmr cmx co- cob coc coe coh com coo cor cox crb crc cre crh crm cro crr crx cxc cxh cxo cxr cxx ebb ebc ebe ebh ebm ebo ebr ebx ec- ecb ecc ece ech ecm eco ecr ecx eeb eec eee eem eeo eer eex ehb ehc ehe ehh ehm eho ehr em- emb emc eme emh emm emo emr emx eo- eob eoc eoe eoh eom eoo eor erb erc ere erh erm ero err ex- exc exe exh exo exr exx hbb hbc hbe hbh hbm hbo hbr hbx hcb hcc hce hch hcm hco hcr he- heb hec hee heh hem heo her hex hhb hhc hhe hhh hhm hho hhr hmb hmc hme hmh hmm hmo hmr hmx hob hoc hoe hoh hom hoo hor hox hr- hrb hrc hre hrh hrm hro hrr hxc hxm m-o m-r mbb mbc mbe mbh mbm mbo mbr mbx mc- mcb mcc mce mch mcm mco mcr mcx meb mec mee meh mem meo mer mex mhc mhh mhm mho mhr mhx mmb mmc mme mmh mmm mmo mmr mmx mob moc moe moh mom moo mor mox mrb mrc mre mrh mrm mro mrr mrx mxc mxr ob- obb obc obe obh obm obo obr obx oc- ocb occ och ocm oco ocr ocx oeb oec oee oeh oem oeo oer oex ohc ohe ohh ohm oho ohr om- omb omc ome omh omm omo omr omx oo- oob ooc ooh oom ooo oor oox or- orb orc ore orh orm oro orr orx ox- oxb oxc oxo oxx rbb rbc rbe rbh rbm rbo rbr rbx rcb rcc rce rch rcm rco rcr rcx re- reb rec ree reh rem reo rer rex rh- rhb rhc rhe rhh rhm rho rhr rmb rmc rme rmh rmm rmo rmr rmx rob roc roe roh rom roo ror rox rrb rrc rrh rrm rrr rxr xbc xbe xbr xbx xcb xch xcr xcx xee xem xer xex xmc xmh xmm xmo xmr xmx xoc xom xoo xor xox xrc xrx xxo xxx