-er b-u bbb bbc bbe bbm bbo bbr bbu bbx bcb bcc bce bcm bco bcr bcu bcx be- beb bec bee bem beo ber beu bex bmb bmc bme bmm bmo bmr bmu bmx bob boc boe bom boo bor bou box brb bre brm bro brr bru brx bub buc bue bum buo bur buu bux bxb bxm bxo bxx c-- cbb cbc cbe cbm cbo cbr cbu cbx ccb ccc cce ccm cco ccr ccu ccx ce- ceb cec cee cem ceo cer ceu cex cmb cmc cme cmm cmo cmr cmu cmx co- cob coc coe com coo cor cou cox crb crc cre crm cro crr cru crx cub cuc cue cum cuo cur cuu cxc cxo cxr cxx ebb ebc ebe ebm ebo ebr ebu ebx ec- ecb ecc ece ecm eco ecr ecu ecx eeb eec eee eem eeo eer eex em- emb emc eme emm emo emr emu emx eo- eob eoc eoe eom eoo eor eou erb erc ere erm ero err eru eu- eub euc eue eur eux ex- exc exe exo exr exu exx m-o m-r mbb mbc mbe mbm mbo mbr mbu mbx mc- mcb mcc mce mcm mco mcr mcu mcx meb mec mee mem meo mer meu mex mmb mmc mme mmm mmo mmr mmu mmx mob moc moe mom moo mor mou mox mrb mrc mre mrm mro mrr mru mrx mub muc mue mum mur muu mux mxc mxr mxu ob- obb obc obe obm obo obr obu obx oc- ocb occ ocm oco ocr ocu ocx oeb oec oee oem oeo oer oex om- omb omc ome omm omo omr omu omx oo- oob ooc oom ooo oor oox or- orb orc ore orm oro orr oru orx ou- ouc oue oum ouo our ox- oxb oxc oxo oxx rbb rbc rbe rbm rbo rbr rbu rbx rcb rcc rce rcm rco rcr rcu rcx re- reb rec ree rem reo rer reu rex rmb rmc rme rmm rmo rmr rmx rob roc roe rom roo ror rou rox rrb rrc rrm rrr rru rub ruc rue rum ruo rur ruu rux rxr ubb ubc ube ubo ubr ubu ubx ucb ucc uce ucm uco ucr ucu ueb uec uee uem uer um- umb umc ume umm umo umr umu uob uoc uoe uom uoo uor uox ur- urb urc ure urm uro urr uru urx uuc uue uum uur uuu uxb uxc uxo uxr uxu xbc xbe xbr xbx xcb xcr xcx xee xem xer xeu xex xmc xmm xmo xmr xmu xmx xoc xom xoo xor xox xrc xrx xue xxo xxx