a-a aaa aam aao aap aar aas ama amm amo amp amr ams aoa aom aoo aop aor aos ap- apa apm apo app apr aps ar- ara arm aro arp arr ars as- asa asm aso asp asr ass m-o m-r maa mam mao map mar mas mma mmm mmo mmp mmr mms moa mom moo mop mor mos mpa mpm mpo mpp mpr mps mra mrm mro mrp mrr mrs msa msm mso msp msr mss oaa oam oao oap oar oas om- oma omm omo omp omr oms oo- ooa oom ooo oop oor oos op- opa opm opo opp opr ops or- ora orm oro orp orr ors os- osa osm oso osp osr oss p-p paa pam pao pap par pas pma pmm pmo pmp pmr pms poa pom poo pop por pos ppa ppm ppo ppp ppr pps pra prm pro prp prr prs ps- psa psm pso psp psr pss ra- raa ram rao rap rar ras rma rmm rmo rmp rmr rms roa rom roo rop ror ros rpa rpm rpo rpp rpr rps rra rrm rrp rrr rrs rsa rsm rso rsp rsr rss saa sam sao sap sar sas sma smm smo smp smr sms soa som soo sop sor sos spa spm spo spp spr sps sr- sra srm sro srp srr srs ss- ssa ssm sso ssp ssr sss