a-a a-b a-i aaa aab aai aan aar aav ab- aba abb abi abn abr abv ai- aia aib aii ain air aiv an- ana anb ani ann anr anv ar- ara arb ari arn arr arv av- ava avb avi avn avr baa bab bai ban bar bav bba bbb bbi bbn bbr bi- bia bib bii bin bir biv bna bnb bni bnn bnr bnv bra brb bri brn brr brv bva bvb bvi bvn bvr bvv i-v ia- iaa iab iai ian iar iav iba ibb ibi ibn ibr ibv iia iib iii iin iir in- ina inb ini inn inr inv ir- ira irb iri irn irr irv iva ivb ivi ivr ivv n-i naa nab nai nan nar nav nba nbb nbi nbn nbr nbv nia nib nii nin nir niv nna nnb nni nnn nnv nra nrb nri nrn nrr nrv nva nvb nvi nvn nvv ra- raa rab rai ran rar rav rba rbb rbi rbn rbr ria rib rii rin rir riv rna rnb rni rnn rnr rnv rra rrb rri rrn rrr rva rvb rvi rvn rvr rvv v-a vaa vab vai van var vav vba vbi vbr vbv vi- via vib vii vin vir viv vn- vna vni vnr vnv vra vrb vri vrn vrr vva vvb vvi vvr vvv