a-a a-b aaa aab aad aan aao aar aav ab- aba abb abd abn abo abr abv ad- ada adb add adn ado adr adv an- ana anb and ann ano anr anv aoa aob aod aon aoo aor aov ar- ara arb ard arn aro arr arv av- ava avb avd avn avo avr baa bab bad ban bao bar bav bba bbb bbd bbn bbo bbr bda bdb bdd bdo bdr bdv bna bnb bnd bnn bno bnr bnv boa bob bod bon boo bor bov bra brb brd brn bro brr brv bva bvb bvd bvn bvo bvr bvv daa dab dad dan dao dar dav dba dbb dbd dbn dbo dbr dbv dda ddb ddd ddn ddo ddr dna dnb dnd dnn dno dnr doa dob dod don doo dor dov dra drb drd drn dro drr drv dva dvb dvd dvn dvr naa nab nad nan nao nar nav nba nbb nbd nbn nbo nbr nbv nda ndb ndd ndn ndo ndr ndv nna nnb nnn nno nnv no- noa nob nod non noo nor nov nra nrb nrd nrn nro nrr nrv nva nvb nvd nvn nvv oaa oab oad oan oao oar oav ob- oba obb obd obn obo obr obv oda odb odd odn odo odr odv on- ona onb ond onn ono onr oo- ooa oob ood oon ooo oor oov or- ora orb ord orn oro orr orv ov- ova ovb ovd ovo ovv ra- raa rab rad ran rao rar rav rba rbb rbd rbn rbo rbr rda rdb rdd rdn rdo rdr rdv rna rnb rnd rnn rno rnr rnv roa rob rod ron roo ror rov rra rrb rrd rrn rrr rva rvb rvd rvn rvo rvr rvv v-a vaa vab vad van vao var vav vba vbd vbo vbr vbv vdb vdd vdo vdr vdv vn- vna vnd vno vnr vnv voa vob vod von voo vor vov vra vrb vrd vrn vrr vva vvb vvo vvr vvv