a-a a-i aaa aaf aai aan aao aap af- afa aff afi afn afo afp ai- aia aif aii ain aio aip an- ana anf ani ann ano anp aoa aof aoi aon aoo aop ap- apa apf api apn apo app faa faf fai fan fao fap ffa fff ffi ffn ffo ffp fia fif fii fin fip fna fnf fni fnn fnp foa fof foi fon foo fop fpa fpi fpn fpo fpp i-f ia- iaa iaf iai ian iao iap ifa iff ifi ifn ifo ifp iia iif iii iin iio iip in- ina inf ini inn ino inp io- ioa iof ioi ion ioo iop ipa ipf ipi ipn ipo ipp n-i naa naf nai nan nao nap nfa nff nfi nfn nfo nfp nia nif nii nin nio nip nna nnf nni nnn nno nnp no- noa nof noi non noo nop npa npf npi npn npo npp o-i oaa oaf oai oan oao oap of- ofa off ofi ofn ofo ofp oia oif oii oin oio oip on- ona onf oni onn ono onp oo- ooa oof ooi oon ooo oop op- opa opf opi opn opo opp p-p paa paf pai pan pao pap pfa pff pfi pfn pfo pfp pia pif pii pin pio pip pn- pna pnf pni pnn pno pnp poa pof poi pon poo pop ppa ppf ppi ppn ppo ppp