a-a a-c aaa aac aam aao aap aas ac- aca acc acm aco acp acs ama amc amm amo amp ams aoa aoc aom aoo aop aos ap- apa apc apm apo app aps as- asa asc asm aso asp ass c-- caa cac cam cao cap cas cca ccc ccm cco ccp ccs cma cmc cmm cmo cmp cms co- coa coc com coo cop cos cpa cpc cpm cpo cpp cps csa csc csm cso csp css m-o maa mac mam mao map mas mc- mca mcc mcm mco mcp mcs mma mmc mmm mmo mmp mms moa moc mom moo mop mos mpa mpc mpm mpo mpp mps msa msc msm mso msp mss oaa oac oam oao oap oas oc- oca occ ocm oco ocp ocs om- oma omc omm omo omp oms oo- ooa ooc oom ooo oop oos op- opa opc opm opo opp ops os- osa osc osm oso osp oss p-p paa pac pam pao pap pas pca pcc pcm pco pcp pcs pma pmc pmm pmo pmp pms poa poc pom poo pop pos ppa ppc ppm ppo ppp pps ps- psa psc psm pso psp pss saa sac sam sao sap sas sca scc scm sco scp scs sma smc smm smo smp sms soa soc som soo sop sos spa spc spm spo spp sps ss- ssa ssc ssm sso ssp sss