c-- ccc ccd ccf ccm cco ccr cct cdc cdd cdf cdm cdo cdr cdt cfc cfd cff cfm cfo cfr cft cmc cmd cmf cmm cmo cmr cmt co- coc cod cof com coo cor cot crc crd crf crm cro crr crt ctc ctd ctf ctm cto ctr ctt dcc dcd dcf dcm dco dcr dct ddc ddd ddf ddm ddo ddr ddt dfc dfd dff dfm dfo dfr dft dmc dmd dmf dmm dmo dmr dmt doc dod dof dom doo dor dot drc drd drm dro drr drt dtc dtd dtf dtm dto dtr dtt fcc fcd fcf fcm fco fcr fct fdc fdd fdf fdm fdo fdr fdt ffc ffd fff ffm ffo ffr fft fmc fmd fmf fmm fmo fmr fmt foc fof fom foo for fot frc frd frf frm fro frr frt ftc ftd ftf ftm fto ftr ftt m-f m-o m-r mc- mcc mcd mcf mcm mco mcr mct mdc mdd mdf mdm mdo mdr mdt mfc mfd mff mfm mfo mfr mft mmc mmd mmf mmm mmo mmr mmt moc mod mof mom moo mor mot mrc mrd mrf mrm mro mrr mrt mtc mtd mtf mtm mto mtr mtt oc- occ ocd ocf ocm oco ocr oct odc odd odf odm odo odr odt of- ofc ofd off ofm ofo ofr oft om- omc omd omf omm omo omr omt oo- ooc ood oof oom ooo oor oot or- orc ord orf orm oro orr ort ot- otc otd otf otm oto otr ott rcc rcd rcf rcm rco rcr rct rdc rdd rdf rdm rdo rdr rdt rfc rfd rff rfm rfo rfr rft rmc rmd rmf rmm rmo rmr rmt roc rod rof rom roo ror rot rrc rrd rrf rrm rrr rrt rtc rtd rtf rtm rto rtr rtt tcc tcd tcf tcm tco tcr tct tdc tdd tdf tdm tdo tdr tdt tfc tfd tff tfm tfo tfr tft tmc tmd tmf tmm tmo tmr tmt to- toc tod tof tom too tor tot trc trd trf trm tro trr trt ttc ttd ttf ttm tto ttr ttt