c-- ccc ccm cco ccp ccs cmc cmm cmo cmp cms co- coc com coo cop cos cpc cpm cpo cpp cps csc csm cso csp css m-o mc- mcc mcm mco mcp mcs mmc mmm mmo mmp mms moc mom moo mop mos mpc mpm mpo mpp mps msc msm mso msp mss oc- occ ocm oco ocp ocs om- omc omm omo omp oms oo- ooc oom ooo oop oos op- opc opm opo opp ops os- osc osm oso osp oss p-p pcc pcm pco pcp pcs pmc pmm pmo pmp pms poc pom poo pop pos ppc ppm ppo ppp pps ps- psc psm pso psp pss scc scm sco scp scs smc smm smo smp sms soc som soo sop sos spc spm spo spp sps ss- ssc ssm sso ssp sss