-er c-- ccc cce ccf cco ccr ccs ccu ce- cec cee cef ceo cer ces ceu cfc cfe cff cfo cfr cfs cfu co- coc coe cof coo cor cos cou crc cre crf cro crr crs cru csc cse csf cso csr css csu cuc cue cuf cuo cur cus cuu ec- ecc ece ecf eco ecr ecs ecu eec eee eef eeo eer ees ef- efc efe eff efo efr efs eo- eoc eoe eof eoo eor eos eou erc ere erf ero err ers eru es- esc ese esf eso esr ess esu eu- euc eue euf eur eus fcc fce fcf fco fcr fcs fcu fec fee fef feo fer fes feu ffc ffe fff ffo ffr ffs ffu foc foe fof foo for fos fou frc fre frf fro frr frs fru fsc fse fsf fso fsr fss fsu fue fuf fuo fur fus fuu oc- occ ocf oco ocr ocs ocu oec oee oef oeo oer oes of- ofc ofe off ofo ofr ofs ofu oo- ooc oof ooo oor oos or- orc ore orf oro orr ors oru os- osc ose osf oso osr oss osu ou- ouc oue ouf ouo our ous rcc rce rcf rco rcr rcs rcu re- rec ree ref reo rer res reu rfc rfe rff rfo rfr rfs rfu roc roe rof roo ror ros rou rrc rrf rrr rrs rru rsc rse rsf rso rsr rss rsu ruc rue ruf ruo rur rus ruu scc sce scf sco scr scs scu se- sec see sef seo ser ses seu sfc sfe sff sfo sfr sfs sfu soc soe sof soo sor sos sou sr- src sre srf sro srr srs ss- ssc sse ssf sso ssr sss ssu suc sue suf suo sur sus suu ucc uce ucf uco ucr ucs ucu uec uee uef uer ues ufc ufe uff ufo ufr ufs ufu uoc uoe uoo uor uos ur- urc ure urf uro urr urs uru usc use usf uso usr uss usu uuc uue uur uus uuu