a-a a-b aaa aab aad aae aao aav ab- aba abb abd abe abo abv ad- ada adb add ade ado adv aea aeb aed aee aeo aev aoa aob aod aoe aoo aov av- ava avb avd ave avo baa bab bad bae bao bav bba bbb bbd bbe bbo bda bdb bdd bde bdo bdv be- bea beb bed bee beo bev boa bob bod boe boo bov bva bvb bvd bve bvo bvv daa dab dad dae dao dav dba dbb dbd dbe dbo dbv dda ddb ddd dde ddo de- dea deb ded dee deo dev doa dob dod doe doo dov dva dvb dvd dve eaa eab ead eae eao eav eba ebb ebd ebe ebo ebv ed- eda edb edd ede edo eea eeb eed eee eeo eev eo- eoa eob eod eoe eoo eva evb evd eve evo evv oaa oab oad oae oao oav ob- oba obb obd obe obo obv oda odb odd ode odo odv oea oeb oed oee oeo oo- ooa oob ood ooo oov ov- ova ovb ovd ove ovo ovv v-a v-e vaa vab vad vae vao vav vba vbd vbo vbv vdb vdd vde vdo vdv vea veb ved vee veo voa vob vod voe voo vov vva vvb vvo vvv