a-a aaa aaf aam aar aax af- afa aff afm afr afx ama amf amm amr amx ar- ara arf arm arr arx ax- axa axm axr axx faa faf fam far fax ffa fff ffm ffr ffx fma fmf fmm fmr fmx fra frf frm frr fxm fxr fxx m-f m-r maa maf mam mar max mfa mff mfm mfr mma mmf mmm mmr mmx mra mrf mrm mrr mrx mxa mxr ra- raa raf ram rar rax rfa rff rfm rfr rma rmf rmm rmr rmx rra rrf rrm rrr rxr xaa xaf xam xar xfa xfm xfx xma xmf xmm xmr xmx xrf xrx xxx