-er c-- ccc ccd cce ccf cco ccr ccs ccu cdc cdd cde cdf cdo cdr cds cdu ce- cec ced cee cef ceo cer ces ceu cfc cfd cfe cff cfo cfr cfs cfu co- coc cod coe cof coo cor cos cou crc crd cre crf cro crr crs cru csc csd cse csf cso csr css csu cuc cud cue cuf cuo cur cus cuu dcc dcd dce dcf dco dcr dcs dcu ddc ddd dde ddf ddo ddr dds ddu de- dec ded dee def deo der des deu dfc dfd dfe dff dfo dfr dfs dfu doc dod doe dof doo dor dos dou drc drd dre dro drr drs dru dsc dsd dse dsf dso dsr dss dsu duc dud due duf duo dur dus ec- ecc ecd ece ecf eco ecr ecs ecu ed- edc edd ede edf edo edr eds edu eec eed eee eef eeo eer ees ef- efc efd efe eff efo efr efs eo- eoc eod eoe eof eoo eor eos eou erc erd ere erf ero err ers eru es- esc esd ese esf eso esr ess esu eu- euc eud eue euf eur eus fcc fcd fce fcf fco fcr fcs fcu fdc fdd fde fdf fdo fdr fds fdu fec fed fee fef feo fer fes feu ffc ffd ffe fff ffo ffr ffs ffu foc foe fof foo for fos fou frc frd fre frf fro frr frs fru fsc fsd fse fsf fso fsr fss fsu fud fue fuf fuo fur fus fuu oc- occ ocd ocf 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 oo- ooc ood oof ooo oor oos or- orc ord ore orf oro orr ors oru os- osc osd ose osf oso osr oss osu ou- ouc oud oue ouf ouo our ous rcc rcd rce rcf rco rcr rcs rcu rdc rdd rde rdf rdo rdr rds rdu re- rec red ree ref reo rer res reu rfc rfd rfe rff rfo rfr rfs rfu roc rod roe rof roo ror ros rou rrc rrd rrf rrr rrs rru rsc rsd rse rsf rso rsr rss rsu ruc rud rue ruf ruo rur rus ruu scc scd sce scf sco scr scs scu sdc sdd sde sdf sdo sdr sds sdu se- sec sed see sef seo ser ses seu sfc sfd sfe sff sfo sfr sfs sfu soc sod soe sof soo sor sos sou sr- src srd sre srf sro srr srs ss- ssc ssd sse ssf sso ssr sss ssu suc sud sue suf suo sur sus suu ucc ucd uce ucf uco ucr ucs ucu udc udd ude udf udo udr uds udu uec ued uee uef uer ues ufc ufd ufe uff ufo ufr ufs ufu uoc uod uoe uoo uor uos ur- urc urd ure urf uro urr urs uru usc usd use usf uso usr uss usu uuc uue uur uus uuu