a-a a-i aaa aaf aai aan aap af- afa aff afi afn afp ai- aia aif aii ain aip an- ana anf ani ann anp ap- apa apf api apn app faa faf fai fan fap ffa fff ffi ffn ffp fia fif fii fin fip fna fnf fni fnn fnp fpa fpi fpn fpp i-f ia- iaa iaf iai ian iap ifa iff ifi ifn ifp iia iif iii iin iip in- ina inf ini inn inp ipa ipf ipi ipn ipp n-i naa naf nai nan nap nfa nff nfi nfn nfp nia nif nii nin nip nna nnf nni nnn nnp npa npf npi npn npp p-p paa paf pai pan pap pfa pff pfi pfn pfp pia pif pii pin pip pn- pna pnf pni pnn pnp ppa ppf ppi ppn ppp