c-- ccc ccd ccm cco ccs cct cdc cdd cdm cdo cds cdt cmc cmd cmm cmo cms cmt co- coc cod com coo cos cot csc csd csm cso css cst ctc ctd ctm cto cts ctt dcc dcd dcm dco dcs dct ddc ddd ddm ddo dds ddt dmc dmd dmm dmo dms dmt doc dod dom doo dos dot dsc dsd dsm dso dss dst dtc dtd dtm dto dts dtt m-o mc- mcc mcd mcm mco mcs mct mdc mdd mdm mdo mds mdt mmc mmd mmm mmo mms mmt moc mod mom moo mos mot msc msd msm mso mss mst mtc mtd mtm mto mts mtt oc- occ ocd ocm oco ocs oct odc odd odm odo ods odt om- omc omd omm omo oms omt oo- ooc ood oom ooo oos oot os- osc osd osm oso oss ost ot- otc otd otm oto ots ott scc scd scm sco scs sct sdc sdd sdm sdo sds sdt smc smd smm smo sms smt soc sod som soo sos sot ss- ssc ssd ssm sso sss sst stc std stm sto sts stt tcc tcd tcm tco tcs tct tdc tdd tdm tdo tds tdt tmc tmd tmm tmo tms tmt to- toc tod tom too tos tot tsc tsd tsm tso tss tst ttc ttd ttm tto tts ttt