a-a a-b a-i aaa aab aad aae aai aao aav ab- aba abb abd abe abi abo abv ad- ada adb add ade adi ado adv aea aeb aed aee aei aeo aev ai- aia aib aid aie aii aio aiv aoa aob aod aoe aoi aoo aov av- ava avb avd ave avi avo baa bab bad bae bai bao bav bba bbb bbd bbe bbi bbo bda bdb bdd bde bdi bdo bdv be- bea beb bed bee bei beo bev bi- bia bib bid bie bii bio biv boa bob bod boe boi boo bov bva bvb bvd bve bvi bvo bvv daa dab dad dae dai dao dav dba dbb dbd dbe dbi dbo dbv dda ddb ddd dde ddi ddo de- dea deb ded dee dei deo dev di- dia dib did die dii dio div doa dob dod doe doi doo dov dva dvb dvd dve dvi eaa eab ead eae eai eao eav eba ebb ebd ebe ebi ebo ebv ed- eda edb edd ede edi edo eea eeb eed eee eeo eev eia eib eid eie eii eio eiv eo- eoa eob eod eoe eoi eoo eva evb evd eve evi evo evv i-d i-v ia- iaa iab iad iae iai iao iav iba ibb ibd ibe ibi ibo ibv ida idb idd ide idi ido idv ie- iea ied iee iei iev iia iib iid iie iii iio io- ioa iob iod ioe ioi ioo iov iva ivb ivd ive ivi ivo ivv o-i oaa oab oad oae oai oao oav ob- oba obb obd obe obi obo obv oda odb odd ode odi odo odv oea oeb oed oee oei oeo oia oib oid oie oii oio oiv oo- ooa oob ood ooi ooo oov ov- ova ovb ovd ove ovi ovo ovv v-a v-e vaa vab vad vae vai vao vav vba vbd vbi vbo vbv vdb vdd vde vdi vdo vdv vea veb ved vee vei veo vi- via vib vid vie vii vio viv voa vob vod voe voi voo vov vva vvb vvi vvo vvv