a-a a-b a-i aaa aab aad aai aao aar aav ab- aba abb abd abi abo abr abv ad- ada adb add adi ado adr adv ai- aia aib aid aii aio air aiv aoa aob aod aoi aoo aor aov ar- ara arb ard ari aro arr arv av- ava avb avd avi avo avr baa bab bad bai bao bar bav bba bbb bbd bbi bbo bbr bda bdb bdd bdi bdo bdr bdv bi- bia bib bid bii bio bir biv boa bob bod boi boo bor bov bra brb brd bri bro brr brv bva bvb bvd bvi bvo bvr bvv daa dab dad dai dao dar dav dba dbb dbd dbi dbo dbr dbv dda ddb ddd ddi ddo ddr di- dia dib did dii dio dir div doa dob dod doi doo dor dov dra drb drd dri dro drr drv dva dvb dvd dvi dvr i-d i-v ia- iaa iab iad iai iao iar iav iba ibb ibd ibi ibo ibr ibv ida idb idd idi ido idr idv iia iib iid iii iio iir io- ioa iob iod ioi ioo ior iov ir- ira irb ird iri iro irr irv iva ivb ivd ivi ivo ivr ivv o-i oaa oab oad oai oao oar oav ob- oba obb obd obi obo obr obv oda odb odd odi odo odr odv oia oib oid oii oio oir oiv oo- ooa oob ood ooi ooo oor oov or- ora orb ord ori oro orr orv ov- ova ovb ovd ovi ovo ovv ra- raa rab rad rai rao rar rav rba rbb rbd rbi rbo rbr rda rdb rdd rdi rdo rdr rdv ria rib rid rii rio rir riv roa rob rod roi roo ror rov rra rrb rrd rri rrr rva rvb rvd rvi rvo rvr rvv v-a vaa vab vad vai vao var vav vba vbd vbi vbo vbr vbv vdb vdd vdi vdo vdr vdv vi- via vib vid vii vio vir viv voa vob vod voi voo vor vov vra vrb vrd vri vrr vva vvb vvi vvo vvr vvv