a-a aaa aaf aam aar aau aax af- afa aff afm afr afu afx ama amf amm amr amu amx ar- ara arf arm arr aru arx au- aua auf aum aur aux ax- axa axm axr axx faa faf fam far fau fax ffa fff ffm ffr ffu ffx fma fmf fmm fmr fmu fmx fra frf frm frr fru fua fuf fum fur fuu fux fxm fxr fxu fxx m-f m-r maa maf mam mar mau max mfa mff mfm mfr mfu mma mmf mmm mmr mmu mmx mra mrf mrm mrr mru mrx mua muf mum mur muu mux mxa mxr mxu ra- raa raf ram rar rau rax rfa rff rfm rfr rfu rma rmf rmm rmr rmx rra rrf rrm rrr rru rua ruf rum rur ruu rux rxr ua- uaa uaf uam uar uau ufa uff ufm ufr ufu ufx um- uma umf umm umr umu ur- ura urf urm urr uru urx uua uum uur uuu uxf uxr uxu xaa xaf xam xar xau xfa xfm xfx xma xmf xmm xmr xmu xmx xrf xrx xxx