a-a aaa aaf aam aao aap aas af- afa aff afm afo afp afs ama amf amm amo amp ams aoa aof aom aoo aop aos ap- apa apf apm apo app aps as- asa asf asm aso asp ass faa faf fam fao fap fas ffa fff ffm ffo ffp ffs fma fmf fmm fmo fmp fms foa fof fom foo fop fos fpa fpm fpo fpp fps fsa fsf fsm fso fsp fss m-f m-o maa maf mam mao map mas mfa mff mfm mfo mfp mfs mma mmf mmm mmo mmp mms moa mof mom moo mop mos mpa mpf mpm mpo mpp mps msa msf msm mso msp mss oaa oaf oam oao oap oas of- ofa off ofm ofo ofp ofs om- oma omf omm omo omp oms oo- ooa oof oom ooo oop oos op- opa opf opm opo opp ops os- osa osf osm oso osp oss p-p paa paf pam pao pap pas pfa pff pfm pfo pfp pfs pma pmf pmm pmo pmp pms poa pof pom poo pop pos ppa ppf ppm ppo ppp pps ps- psa psf psm pso psp pss saa saf sam sao sap sas sfa sff sfm sfo sfp sfs sma smf smm smo smp sms soa sof som soo sop sos spa spf spm spo spp sps ss- ssa ssf ssm sso ssp sss