a-a aaa aaf aam aan aao aas af- afa aff afm afn afo afs ama amf amm amn amo ams an- ana anf anm ann ano ans aoa aof aom aon aoo aos as- asa asf asm asn aso ass faa faf fam fan fao fas ffa fff ffm ffn ffo ffs fma fmf fmm fmn fmo fms fna fnf fnm fnn fns foa fof fom fon foo fos fsa fsf fsm fsn fso fss m-f m-o maa maf mam man mao mas mfa mff mfm mfn mfo mfs mma mmf mmm mmn mmo mms mna mnf mnm mnn mno mns moa mof mom mon moo mos msa msf msm msn mso mss naa naf nam nan nao nas nfa nff nfn nfo nfs nma nmm nmn nmo nms nna nnf nnm nnn nno nns no- noa nof nom non noo nos nsa nsf nsm nsn nso nss oaa oaf oam oan oao oas of- ofa off ofm ofn ofo ofs om- oma omf omm omn omo oms on- ona onf onn ono ons oo- ooa oof oom oon ooo oos os- osa osf osm osn oso oss saa saf sam san sao sas sfa sff sfm sfn sfo sfs sma smf smm smn smo sms sna snf snm snn sno sns soa sof som son soo sos ss- ssa ssf ssm ssn sso sss