-er c-- ccc ccd cce ccf cck cco ccr ccs ccu cdc cdd cde cdf cdk cdo cdr cds cdu ce- cec ced cee cef cek ceo cer ces ceu cfc cfd cfe cff cfk cfo cfr cfs cfu ckc ckd cko cks co- coc cod coe cof cok coo cor cos cou crc crd cre crf crk cro crr crs cru csc csd cse csf csk cso csr css csu cuc cud cue cuf cuk cuo cur cus cuu dcc dcd dce dcf dck dco dcr dcs dcu ddc ddd dde ddf ddk ddo ddr dds ddu de- dec ded dee def dek deo der des deu dfc dfd dfe dff dfk dfo dfr dfs dfu dkc dke dkk dko dkr dks dku doc dod doe dof dok doo dor dos dou drc drd dre drk dro drr drs dru dsc dsd dse dsf dsk dso dsr dss dsu duc dud due duf duk duo dur dus ec- ecc ecd ece ecf eck eco ecr ecs ecu ed- edc edd ede edf edk edo edr eds edu eec eed eee eef eek eeo eer ees ef- efc efd efe eff efo efr efs ekc ekd eke ekf eko ekr eks eku eo- eoc eod eoe eof eok eoo eor eos eou erc erd ere erf erk ero err ers eru es- esc esd ese esf esk eso esr ess esu eu- euc eud eue euf eur eus fcc fcd fce fcf fck fco fcr fcs fcu fdc fdd fde fdf fdk fdo fdr fds fdu fec fed fee fef fek feo fer fes feu ffc ffd ffe fff ffk ffo ffr ffs ffu fkc fkf fkk foc foe fof fok foo for fos fou frc frd fre frf frk fro frr frs fru fsc fsd fse fsf fsk fso fsr fss fsu fud fue fuf fuk fuo fur fus fuu kcc kcd kce kck kcr kcs kcu kdc kde kdf kdk kdo kdr kds kdu ke- kec ked kee kef kek keo ker kes kfc kfd kff kfo kfs kfu kkc kke kkk kkr kks kku koc kod koe kof kok koo kor kos kou krc krd krf krk kro krr krs kru ksc ksd kse ksf ksk kso ksr kss ksu kuc kud kue kuk kur kus kuu oc- occ ocd ocf ock oco ocr ocs ocu odc odd ode odf odo odr ods odu oec oed oee oef oeo oer oes of- ofc ofd ofe off ofo ofr ofs ofu okc okd oke okk oko okr oks oku oo- ooc ood oof ook ooo oor oos or- orc ord ore orf ork oro orr ors oru os- osc osd ose osf osk oso osr oss osu ou- ouc oud oue ouf ouk ouo our ous rcc rcd rce rcf rco rcr rcs rcu rdc rdd rde rdf rdo rdr rds rdu re- rec red ree ref rek reo rer res reu rfc rfd rfe rff rfk rfo rfr rfs rfu rkc rke rkf rkk rko rks rku roc rod roe rof rok roo ror ros rou rrc rrd rrf rrk rrr rrs rru rsc rsd rse rsf rsk rso rsr rss rsu ruc rud rue ruf ruk ruo rur rus ruu scc scd sce scf sck sco scr scs scu sdc sdd sde sdf sdk sdo sdr sds sdu se- sec sed see sef sek seo ser ses seu sfc sfd sfe sff sfk sfo sfr sfs sfu sk- skc skd ske skf skk sko skr sks sku soc sod soe sof sok soo sor sos sou sr- src srd sre srf srk sro srr srs ss- ssc ssd sse ssf ssk sso ssr sss ssu suc sud sue suf suk suo sur sus suu ucc ucd uce ucf uck uco ucr ucs ucu udc udd ude udf udk udo udr uds udu uec ued uee uef uer ues ufc ufd ufe uff ufo ufr ufs ufu ukc uke ukf ukk ukr uku uoc uod uoe uok uoo uor uos ur- urc urd ure urf urk uro urr urs uru usc usd use usf usk uso usr uss usu uuc uue uur uus uuu