a-a a-b aaa aab aae aam aav ab- aba abb abe abm abv aea aeb aee aem aev ama amb ame amm amv av- ava avb ave avm baa bab bae bam bav bba bbb bbe bbm be- bea beb bee bem bev bma bmb bme bmm bmv bva bvb bve bvm bvv eaa eab eae eam eav eba ebb ebe ebm ebv eea eeb eee eem eev em- ema emb eme emm emv eva evb eve evm evv m-v maa mab mae mam mav mba mbb mbe mbm mbv mea meb mee mem mev mma mmb mme mmm mmv mva mvb mve mvm mvv v-a v-e vaa vab vae vam vav vba vbm vbv vea veb vee vem vm- vma vmm vva vvb vvm vvv