a-a a-b a-i aaa aab aad aai aav ab- aba abb abd abi abv ad- ada adb add adi adv ai- aia aib aid aii aiv av- ava avb avd avi baa bab bad bai bav bba bbb bbd bbi bda bdb bdd bdi bdv bi- bia bib bid bii biv bva bvb bvd bvi bvv daa dab dad dai dav dba dbb dbd dbi dbv dda ddb ddd ddi di- dia dib did dii div dva dvb dvd dvi i-d i-v ia- iaa iab iad iai iav iba ibb ibd ibi ibv ida idb idd idi idv iia iib iid iii iva ivb ivd ivi ivv v-a vaa vab vad vai vav vba vbd vbi vbv vdb vdd vdi vdv vi- via vib vid vii viv vva vvb vvi vvv