-er c-- ccc cce ccf cco ccr ccs ccu ccx ce- cec cee cef ceo cer ces ceu cex cfc cfe cff cfo cfr cfs cfu cfx co- coc coe cof coo cor cos cou cox crc cre crf cro crr crs cru crx csc cse csf cso csr css csu csx cuc cue cuf cuo cur cus cuu cxc cxf cxo cxr cxs cxx ec- ecc ece ecf eco ecr ecs ecu ecx eec eee eef eeo eer ees eex ef- efc efe eff efo efr efs efx eo- eoc eoe eof eoo eor eos eou erc ere erf ero err ers eru es- esc ese esf eso esr ess esu esx eu- euc eue euf eur eus eux ex- exc exe exo exr exs exu exx fcc fce fcf fco fcr fcs fcu fcx fec fee fef feo fer fes feu fex ffc ffe fff ffo ffr ffs ffu ffx foc foe fof foo for fos fou fox frc fre frf fro frr frs fru fsc fse fsf fso fsr fss fsu fsx fue fuf fuo fur fus fuu fux fxe fxr fxs fxu fxx oc- occ ocf oco ocr ocs ocu ocx oec oee oef oeo oer oes oex of- ofc ofe off ofo ofr ofs ofu ofx oo- ooc oof ooo oor oos oox or- orc ore orf oro orr ors oru orx os- osc ose osf oso osr oss osu osx ou- ouc oue ouf ouo our ous ox- oxc oxf oxo oxx rcc rce rcf rco rcr rcs rcu rcx re- rec ree ref reo rer res reu rex rfc rfe rff rfo rfr rfs rfu roc roe rof roo ror ros rou rox rrc rrf rrr rrs rru rsc rse rsf rso rsr rss rsu rsx ruc rue ruf ruo rur rus ruu rux rxr rxs scc sce scf sco scr scs scu scx se- sec see sef seo ser ses seu sex sfc sfe sff sfo sfr sfs sfu sfx soc soe sof soo sor sos sou sox sr- src sre srf sro srr srs srx ss- ssc sse ssf sso ssr sss ssu ssx suc sue suf suo sur sus suu sux sxc sxs sxu ucc uce ucf uco ucr ucs ucu uec uee uef uer ues ufc ufe uff ufo ufr ufs ufu ufx uoc uoe uoo uor uos uox ur- urc ure urf uro urr urs uru urx usc use usf uso usr uss usu usx uuc uue uur uus uuu uxc uxf uxo uxr uxu xcf xcr xcx xee xer xes xeu xex xfe xfs xfx xoc xof xoo xor xos xox xrc xrf xrx xsc xss xue xus xxo xxx