a-a a-b a-z aaa aab aad aan aar aav aaz ab- aba abb abd abn abr abv abz ad- ada adb add adn adr adv adz an- ana anb and ann anr anv anz ar- ara arb ard arn arr arv arz av- ava avb avd avn avr avz az- aza azb azd azn azz baa bab bad ban bar bav baz bba bbb bbd bbn bbr bda bdb bdd bdr bdv bdz bna bnb bnd bnn bnr bnv bnz bra brb brd brn brr brv brz bva bvb bvd bvn bvr bvv bza bzd bzn bzr bzz daa dab dad dan dar dav daz dba dbb dbd dbn dbr dbv dbz dda ddb ddd ddn ddr ddz dna dnb dnd dnn dnr dnz dra drb drd drn drr drv drz dva dvb dvd dvn dvr dza dzb dzd dzr naa nab nad nan nar nav naz nba nbb nbd nbn nbr nbv nda ndb ndd ndn ndr ndv nna nnb nnn nnv nnz nra nrb nrd nrn nrr nrv nrz nva nvb nvd nvn nvv nzb nzd nzz ra- raa rab rad ran rar rav raz rba rbb rbd rbn rbr rda rdb rdd rdn rdr rdv rna rnb rnd rnn rnr rnv rnz rra rrb rrd rrn rrr rva rvb rvd rvn rvr rvv rza rzb v-a vaa vab vad van var vav vaz vba vbd vbr vbv vbz vdb vdd vdr vdv vn- vna vnd vnr vnv vra vrb vrd vrn vrr vva vvb vvr vvv vvz vzn zaa zab zad zan zar zav zaz zbb zbr zbv zdv znd znn zzr zzz