c-- ccc ccm cco ccs cct cmc cmm cmo cms cmt cmy co- coc com coo cos cot coy csc csm cso css cst csy ctc ctm cto cts ctt cty cyc cym cyo cys cyt m-o mc- mcc mcm mco mcs mct mmc mmm mmo mms mmt moc mom moo mos mot moy msc msm mso mss mst msy mtc mtm mto mts mtt my- myc mym myo mys myt oc- occ ocm oco ocs oct om- omc omm omo oms omt omy oo- ooc oom ooo oos oot os- osc osm oso oss ost ot- otc otm oto ots ott oyo oys scc scm sco scs sct smc smm smo sms smt smy soc som soo sos sot soy ss- ssc ssm sso sss sst stc stm sto sts stt sty sy- syc sym sys syt tcc tcm tco tcs tct tmc tmm tmo tms tmt tmy to- toc tom too tos tot toy tsc tsm tso tss tst tsy ttc ttm tto tts ttt tty tyc tym tyo tys tyt ycc yco ycs ycy ymc ymm ymo yms ymt yoc yom yoo yos yot yoy ysc ysm yso yss yst ysy ytc ytm yto yts ytt yyc yys yyt yyy