c-- ccc cce ccf ccm cco ccs cct ce- cec cee cef cem ceo ces cet cfc cfe cff cfm cfo cfs cft cmc cme cmf cmm cmo cms cmt co- coc coe cof com coo cos cot csc cse csf csm cso css cst ctc cte ctf ctm cto cts ctt ec- ecc ece ecf ecm eco ecs ect eec eee eef eem eeo ees eet ef- efc efe eff efm efo efs eft em- emc eme emf emm emo ems emt eo- eoc eoe eof eom eoo eos eot es- esc ese esf esm eso ess est etc ete etf etm eto ets ett fcc fce fcf fcm fco fcs fct fec fee fef fem feo fes fet ffc ffe fff ffm ffo ffs fft fmc fme fmf fmm fmo fms fmt foc foe fof fom foo fos fot fsc fse fsf fsm fso fss fst ftc fte ftf ftm fto fts ftt m-f m-o mc- mcc mce mcf mcm mco mcs mct mec mee mef mem meo mes met mfc mfe mff mfm mfo mfs mft mmc mme mmf mmm mmo mms mmt moc moe mof mom moo mos mot msc mse msf msm mso mss mst mtc mte mtf mtm mto mts mtt oc- occ ocf ocm oco ocs oct oec oee oef oem oeo oes oet of- ofc ofe off ofm ofo ofs oft om- omc ome omf omm omo oms omt oo- ooc oof oom ooo oos oot os- osc ose osf osm oso oss ost ot- otc ote otf otm oto ots ott scc sce scf scm sco scs sct se- sec see sef sem seo ses set sfc sfe sff sfm sfo sfs sft smc sme smf smm smo sms smt soc soe sof som soo sos sot ss- ssc sse ssf ssm sso sss sst stc ste stf stm sto sts stt tcc tce tcf tcm tco tcs tct te- tec tee tef tem teo tes tet tfc tfe tff tfm tfo tfs tft tmc tme tmf tmm tmo tms tmt to- toc toe tof tom too tos tot tsc tse tsf tsm tso tss tst ttc tte ttf ttm tto tts ttt