a-a a-i aaa aai aan aap aar aax ai- aia aii ain aip air aix an- ana ani ann anp anr anx ap- apa api apn app apr apx ar- ara ari arn arp arr arx ax- axa axi axn axp axr axx ia- iaa iai ian iap iar iia iii iin iip iir iix in- ina ini inn inp inr inx ipa ipi ipn ipp ipr ipx ir- ira iri irn irp irr irx ixi ixn n-i naa nai nan nap nar nax nia nii nin nip nir nix nna nni nnn nnp npa npi npn npp npr nra nri nrn nrp nrr nrx p-p paa pai pan pap par pax pia pii pin pip pir pix pn- pna pni pnn pnp pnr pnx ppa ppi ppn ppp ppr ppx pra pri prn prp prr prx pxr ra- raa rai ran rap rar rax ria rii rin rip rir rix rna rni rnn rnp rnr rpa rpi rpn rpp rpr rpx rra rri rrn rrp rrr rxp rxr xaa xan xap xar xia xii xin xix xna xpa xpn xpp xrx xxi xxp xxx