-er c-- ccc cce ccm cco ccr ccs ccu ccx ce- cec cee cem ceo cer ces ceu cex cmc cme cmm cmo cmr cms cmu cmx co- coc coe com coo cor cos cou cox crc cre crm cro crr crs cru crx csc cse csm cso csr css csu csx cuc cue cum cuo cur cus cuu cxc cxo cxr cxs cxx ec- ecc ece ecm eco ecr ecs ecu ecx eec eee eem eeo eer ees eex em- emc eme emm emo emr ems emu emx eo- eoc eoe eom eoo eor eos eou erc ere erm ero err ers eru es- esc ese esm eso esr ess esu esx eu- euc eue eur eus eux ex- exc exe exo exr exs exu exx m-o m-r mc- mcc mce mcm mco mcr mcs mcu mcx mec mee mem meo mer mes meu mex mmc mme mmm mmo mmr mms mmu mmx moc moe mom moo mor mos mou mox mrc mre mrm mro mrr mrs mru mrx msc mse msm mso msr mss msu msx muc mue mum mur mus muu mux mxc mxr mxs mxu oc- occ ocm oco ocr ocs ocu ocx oec oee oem oeo oer oes oex om- omc ome omm omo omr oms omu omx oo- ooc oom ooo oor oos oox or- orc ore orm oro orr ors oru orx os- osc ose osm oso osr oss osu osx ou- ouc oue oum ouo our ous ox- oxc oxo oxx rcc rce rcm rco rcr rcs rcu rcx re- rec ree rem reo rer res reu rex rmc rme rmm rmo rmr rms rmx roc roe rom roo ror ros rou rox rrc rrm rrr rrs rru rsc rse rsm rso rsr rss rsu rsx ruc rue rum ruo rur rus ruu rux rxr rxs scc sce scm sco scr scs scu scx se- sec see sem seo ser ses seu sex smc sme smm smo smr sms smu smx soc soe som soo sor sos sou sox sr- src sre srm sro srr srs srx ss- ssc sse ssm sso ssr sss ssu ssx suc sue sum suo sur sus suu sux sxc sxm sxs sxu ucc uce ucm uco ucr ucs ucu uec uee uem uer ues um- umc ume umm umo umr ums umu uoc uoe uom uoo uor uos uox ur- urc ure urm uro urr urs uru urx usc use usm uso usr uss usu usx uuc uue uum uur uus uuu uxc uxo uxr uxu xcr xcx xee xem xer xes xeu xex xmc xmm xmo xmr xms xmu xmx xoc xom xoo xor xos xox xrc xrx xsc xsm xss xue xus xxo xxx