a-a aaa aaf aam aao aap aar aas af- afa aff afm afo afp afr afs ama amf amm amo amp amr ams aoa aof aom aoo aop aor aos ap- apa apf apm apo app apr aps ar- ara arf arm aro arp arr ars as- asa asf asm aso asp asr ass faa faf fam fao fap far fas ffa fff ffm ffo ffp ffr ffs fma fmf fmm fmo fmp fmr fms foa fof fom foo fop for fos fpa fpm fpo fpp fpr fps fra frf frm fro frp frr frs fsa fsf fsm fso fsp fsr fss m-f m-o m-r maa maf mam mao map mar mas mfa mff mfm mfo mfp mfr mfs mma mmf mmm mmo mmp mmr mms moa mof mom moo mop mor mos mpa mpf mpm mpo mpp mpr mps mra mrf mrm mro mrp mrr mrs msa msf msm mso msp msr mss oaa oaf oam oao oap oar oas of- ofa off ofm ofo ofp ofr ofs om- oma omf omm omo omp omr oms oo- ooa oof oom ooo oop oor oos op- opa opf opm opo opp opr ops or- ora orf orm oro orp orr ors os- osa osf osm oso osp osr oss p-p paa paf pam pao pap par pas pfa pff pfm pfo pfp pfr pfs pma pmf pmm pmo pmp pmr pms poa pof pom poo pop por pos ppa ppf ppm ppo ppp ppr pps pra prf prm pro prp prr prs ps- psa psf psm pso psp psr pss ra- raa raf ram rao rap rar ras rfa rff rfm rfo rfp rfr rfs rma rmf rmm rmo rmp rmr rms roa rof rom roo rop ror ros rpa rpf rpm rpo rpp rpr rps rra rrf rrm rrp rrr rrs rsa rsf rsm rso rsp rsr rss saa saf sam sao sap sar sas sfa sff sfm sfo sfp sfr sfs sma smf smm smo smp smr sms soa sof som soo sop sor sos spa spf spm spo spp spr sps sr- sra srf srm sro srp srr srs ss- ssa ssf ssm sso ssp ssr sss