a-a aaa aam aao aap aas ama amm amo amp ams aoa aom aoo aop aos ap- apa apm apo app aps as- asa asm aso asp ass m-o maa mam mao map mas mma mmm mmo mmp mms moa mom moo mop mos mpa mpm mpo mpp mps msa msm mso msp mss oaa oam oao oap oas om- oma omm omo omp oms oo- ooa oom ooo oop oos op- opa opm opo opp ops os- osa osm oso osp oss p-p paa pam pao pap pas pma pmm pmo pmp pms poa pom poo pop pos ppa ppm ppo ppp pps ps- psa psm pso psp pss saa sam sao sap sas sma smm smo smp sms soa som soo sop sos spa spm spo spp sps ss- ssa ssm sso ssp sss