a-a a-i aaa aai aan aao aap aar aax ai- aia aii ain aio aip air aix an- ana ani ann ano anp anr anx aoa aoi aon aoo aop aor aox ap- apa api apn apo app apr apx ar- ara ari arn aro arp arr arx ax- axa axi axn axo axp axr axx ia- iaa iai ian iao iap iar iia iii iin iio iip iir iix in- ina ini inn ino inp inr inx io- ioa ioi ion ioo iop ior ipa ipi ipn ipo ipp ipr ipx ir- ira iri irn iro irp irr irx ixi ixn n-i naa nai nan nao nap nar nax nia nii nin nio nip nir nix nna nni nnn nno nnp no- noa noi non noo nop nor nox npa npi npn npo npp npr nra nri nrn nro nrp nrr nrx o-i oaa oai oan oao oap oar oax oia oii oin oio oip oir on- ona oni onn ono onp onr onx oo- ooa ooi oon ooo oop oor oox op- opa opi opn opo opp opr opx or- ora ori orn oro orp orr orx ox- oxa oxi oxn oxo oxx p-p paa pai pan pao pap par pax pia pii pin pio pip pir pix pn- pna pni pnn pno pnp pnr pnx poa poi pon poo pop por pox ppa ppi ppn ppo ppp ppr ppx pra pri prn pro prp prr prx pxr ra- raa rai ran rao rap rar rax ria rii rin rio rip rir rix rna rni rnn rno rnp rnr roa roi ron roo rop ror rox rpa rpi rpn rpo rpp rpr rpx rra rri rrn rrp rrr rxp rxr xaa xan xap xar xia xii xin xio xix xna xno xoa xoi xon xoo xop xor xox xpa xpn xpo xpp xrx xxi xxo xxp xxx