a-a a-b aaa aab aae aaf aah aav ab- aba abb abe abf abh abv aea aeb aee aef aeh aev af- afa afb afe aff afh afv aha ahb ahe ahf ahh ahv av- ava avb ave avf avh baa bab bae baf bah bav bba bbb bbe bbf bbh be- bea beb bee bef beh bev bfa bfb bfe bff bfh bfv bha bhb bhe bhf bhh bhv bva bvb bve bvh bvv eaa eab eae eaf eah eav eba ebb ebe ebf ebh ebv eea eeb eee eef eev ef- efa efb efe eff efh eha ehb ehe ehf ehh ehv eva evb eve evf evh evv faa fab fae faf fah fav fba fbb fbe fbf fbh fea feb fee fef feh fev ffa ffe fff ffh ffv fha fhb fhe fhf fhh fhv fva fvh haa hab hae haf hah hav hba hbb hbe hbf hbh hbv he- hea heb hee hef heh hev hfa hfb hfe hff hfh hfv hha hhb hhe hhf hhh hhv hv- hva hvb hvf hvv v-a v-e vaa vab vae vah vav vba vbh vbv vea veb vee vef veh vfa vfb vff vfv vh- vha vhb vhe vhf vva vvb vvv