a-a a-b a-i aaa aab aae aai aav ab- aba abb abe abi abv aea aeb aee aei aev ai- aia aib aie aii aiv av- ava avb ave avi baa bab bae bai bav bba bbb bbe bbi be- bea beb bee bei bev bi- bia bib bie bii biv bva bvb bve bvi bvv eaa eab eae eai eav eba ebb ebe ebi ebv eea eeb eee eev eia eib eie eii eiv eva evb eve evi evv i-v ia- iaa iab iae iai iav iba ibb ibe ibi ibv ie- iea iee iei iev iia iib iie iii iva ivb ive ivi ivv v-a v-e vaa vab vae vai vav vba vbi vbv vea veb vee vei vi- via vib vie vii viv vva vvb vvi vvv