a-a aaa aaf aan aar aau af- afa aff afn afr afu an- ana anf ann anr anu ar- ara arf arn arr aru au- aua auf aun aur faa faf fan far fau ffa fff ffn ffr ffu fna fnf fnn fnr fnu fra frf frn frr fru fua fuf fun fur fuu naa naf nan nar nau nfa nff nfn nfr nfu nna nnf nnn nnu nra nrf nrn nrr nru nua nun nur nuu ra- raa raf ran rar rau rfa rff rfn rfr rfu rna rnn rnr rnu rra rrf rrn rrr rru rua ruf run rur ruu ua- uaa uaf uan uar uau ufa uff ufn ufr ufu un- una unf unn unr unu ur- ura urf urn urr uru uua uun uur uuu