a-a a-i aaa aaf aai aan aar aas af- afa aff afi afn afr afs ai- aia aif aii ain air ais an- ana anf ani ann anr ans ar- ara arf ari arn arr ars as- asa asf asi asn asr ass faa faf fai fan far fas ffa fff ffi ffn ffr ffs fia fif fii fin fir fis fna fnf fni fnn fnr fns fra frf fri frn frr frs fsa fsf fsi fsn fsr fss i-f ia- iaa iaf iai ian iar ias ifa iff ifi ifn ifr ifs iia iif iii iin iir iis in- ina inf ini inn inr ins ir- ira irf iri irn irr irs is- isa isf isi isn isr iss n-i naa naf nai nan nar nas nfa nff nfi nfn nfr nfs nia nif nii nin nir nis nna nnf nni nnn nns nra nrf nri nrn nrr nrs nsa nsf nsi nsn nsr nss ra- raa raf rai ran rar ras rfa rff rfi rfn rfr rfs ria rif rii rin rir ris rna rni rnn rnr rns rra rrf rri rrn rrr rrs rsa rsf rsi rsn rsr rss saa saf sai san sar sas sfa sff sfi sfn sfr sfs sia sif sii sin sir sis sna snf sni snn snr sns sr- sra srf sri srn srr srs ss- ssa ssf ssi ssn ssr sss