a-a a-i aaa aaf aai aan aap aar aax af- afa aff afi afn afp afr afx ai- aia aif aii ain aip air aix an- ana anf ani ann anp anr anx ap- apa apf api apn app apr apx ar- ara arf ari arn arp arr arx ax- axa axi axn axp axr axx faa faf fai fan fap far fax ffa fff ffi ffn ffp ffr ffx fia fif fii fin fip fir fix fna fnf fni fnn fnp fnr fnx fpa fpi fpn fpp fpr fpx fra frf fri frn frp frr fxi fxp fxr fxx i-f ia- iaa iaf iai ian iap iar ifa iff ifi ifn ifp ifr ifx iia iif iii iin iip iir iix in- ina inf ini inn inp inr inx ipa ipf ipi ipn ipp ipr ipx ir- ira irf iri irn irp irr irx ixi ixn n-i naa naf nai nan nap nar nax nfa nff nfi nfn nfp nfr nia nif nii nin nip nir nix nna nnf nni nnn nnp npa npf npi npn npp npr nra nrf nri nrn nrp nrr nrx p-p paa paf pai pan pap par pax pfa pff pfi pfn pfp pfr pfx pia pif pii pin pip pir pix pn- pna pnf pni pnn pnp pnr pnx ppa ppf ppi ppn ppp ppr ppx pra prf pri prn prp prr prx pxr ra- raa raf rai ran rap rar rax rfa rff rfi rfn rfp rfr ria rif rii rin rip rir rix rna rni rnn rnp rnr rpa rpf rpi rpn rpp rpr rpx rra rrf rri rrn rrp rrr rxp rxr xaa xaf xan xap xar xfa xfn xfx xia xii xin xix xna xpa xpf xpn xpp xrf xrx xxi xxp xxx