a-a a-b a-t aaa aab aad aan aat aav ab- aba abb abd abn abt abv ad- ada adb add adn adt adv an- ana anb and ann ant anv at- ata atb atd atn att atv av- ava avb avd avn avt baa bab bad ban bat bav bba bbb bbd bbn bbt bda bdb bdd bdt bdv bna bnb bnd bnn bnt bnv bta btb btd btn btt btv bva bvb bvd bvn bvt bvv daa dab dad dan dat dav dba dbb dbd dbn dbt dbv dda ddb ddd ddn ddt dna dnb dnd dnn dnt dta dtb dtd dtn dtt dtv dva dvb dvd dvn dvt naa nab nad nan nat nav nba nbb nbd nbn nbt nbv nda ndb ndd ndn ndt ndv nna nnb nnn nnt nnv nta ntb ntd ntn ntt ntv nva nvb nvd nvn nvt nvv taa tab tad tan tat tav tba tbb tbd tbn tbt tbv tda tdb tdd tdn tdt tdv tna tnb tnd tnn tnt tta ttb ttd ttn ttt ttv tva tvb tvd tvn tvt v-a vaa vab vad van vat vav vba vbd vbv vdb vdd vdt vdv vn- vna vnd vnv vta vtb vtt vtv vva vvb vvt vvv