c-- ccc ccd ccm cco ccr cct cdc cdd cdm cdo cdr cdt cmc cmd cmm cmo cmr cmt co- coc cod com coo cor cot crc crd crm cro crr crt ctc ctd ctm cto ctr ctt dcc dcd dcm dco dcr dct ddc ddd ddm ddo ddr ddt dmc dmd dmm dmo dmr dmt doc dod dom doo dor dot drc drd drm dro drr drt dtc dtd dtm dto dtr dtt m-o m-r mc- mcc mcd mcm mco mcr mct mdc mdd mdm mdo mdr mdt mmc mmd mmm mmo mmr mmt moc mod mom moo mor mot mrc mrd mrm mro mrr mrt mtc mtd mtm mto mtr mtt oc- occ ocd ocm oco ocr oct odc odd odm odo odr odt om- omc omd omm omo omr omt oo- ooc ood oom ooo oor oot or- orc ord orm oro orr ort ot- otc otd otm oto otr ott rcc rcd rcm rco rcr rct rdc rdd rdm rdo rdr rdt rmc rmd rmm rmo rmr rmt roc rod rom roo ror rot rrc rrd rrm rrr rrt rtc rtd rtm rto rtr rtt tcc tcd tcm tco tcr tct tdc tdd tdm tdo tdr tdt tmc tmd tmm tmo tmr tmt to- toc tod tom too tor tot trc trd trm tro trr trt ttc ttd ttm tto ttr ttt