-er c-- ccc cce ccf ccm cco ccr cct ce- cec cee cef cem ceo cer cet cfc cfe cff cfm cfo cfr cft cmc cme cmf cmm cmo cmr cmt co- coc coe cof com coo cor cot crc cre crf crm cro crr crt ctc cte ctf ctm cto ctr ctt ec- ecc ece ecf ecm eco ecr ect eec eee eef eem eeo eer eet ef- efc efe eff efm efo efr eft em- emc eme emf emm emo emr emt eo- eoc eoe eof eom eoo eor eot erc ere erf erm ero err ert etc ete etf etm eto etr ett fcc fce fcf fcm fco fcr fct fec fee fef fem feo fer fet ffc ffe fff ffm ffo ffr fft fmc fme fmf fmm fmo fmr fmt foc foe fof fom foo for fot frc fre frf frm fro frr frt ftc fte ftf ftm fto ftr ftt m-f m-o m-r mc- mcc mce mcf mcm mco mcr mct mec mee mef mem meo mer met mfc mfe mff mfm mfo mfr mft mmc mme mmf mmm mmo mmr mmt moc moe mof mom moo mor mot mrc mre mrf mrm mro mrr mrt mtc mte mtf mtm mto mtr mtt oc- occ ocf ocm oco ocr oct oec oee oef oem oeo oer oet of- ofc ofe off ofm ofo ofr oft om- omc ome omf omm omo omr omt oo- ooc oof oom ooo oor oot or- orc ore orf orm oro orr ort ot- otc ote otf otm oto otr ott rcc rce rcf rcm rco rcr rct re- rec ree ref rem reo rer ret rfc rfe rff rfm rfo rfr rft rmc rme rmf rmm rmo rmr rmt roc roe rof rom roo ror rot rrc rrf rrm rrr rrt rtc rte rtf rtm rto rtr rtt tcc tce tcf tcm tco tcr tct te- tec tee tef tem teo ter tet tfc tfe tff tfm tfo tfr tft tmc tme tmf tmm tmo tmr tmt to- toc toe tof tom too tor tot trc tre trf trm tro trr trt ttc tte ttf ttm tto ttr ttt