a-a a-i aaa aaf aai aan aar aax af- afa aff afi afn afr afx ai- aia aif aii ain air aix an- ana anf ani ann anr anx ar- ara arf ari arn arr arx ax- axa axi axn axr axx faa faf fai fan far fax ffa fff ffi ffn ffr ffx fia fif fii fin fir fix fna fnf fni fnn fnr fnx fra frf fri frn frr fxi fxr fxx i-f ia- iaa iaf iai ian iar ifa iff ifi ifn ifr ifx iia iif iii iin iir iix in- ina inf ini inn inr inx ir- ira irf iri irn irr irx ixi ixn n-i naa naf nai nan nar nax nfa nff nfi nfn nfr nia nif nii nin nir nix nna nnf nni nnn nra nrf nri nrn nrr nrx ra- raa raf rai ran rar rax rfa rff rfi rfn rfr ria rif rii rin rir rix rna rni rnn rnr rra rrf rri rrn rrr rxr xaa xaf xan xar xfa xfn xfx xia xii xin xix xna xrf xrx xxi xxx