c-- ccc cch ccm cco ccs ch- chc chh chm cho chs cmc cmh cmm cmo cms co- coc coh com coo cos csc csh csm cso css hcc hch hcm hco hcs hhc hhh hhm hho hhs hmc hmh hmm hmo hms hoc hoh hom hoo hos hsc hsh hsm hss m-o mc- mcc mch mcm mco mcs mhc mhh mhm mho mhs mmc mmh mmm mmo mms moc moh mom moo mos msc msh msm mso mss oc- occ och ocm oco ocs ohc ohh ohm oho ohs om- omc omh omm omo oms oo- ooc ooh oom ooo oos os- osc osh osm oso oss scc sch scm sco scs sh- shc shh shm sho shs smc smh smm smo sms soc soh som soo sos ss- ssc ssh ssm sso sss