a-a a-b a-t aaa aab aad aar aat aav ab- aba abb abd abr abt abv ad- ada adb add adr adt adv ar- ara arb ard arr art arv at- ata atb atd atr att atv av- ava avb avd avr avt baa bab bad bar bat bav bba bbb bbd bbr bbt bda bdb bdd bdr bdt bdv bra brb brd brr brt brv bta btb btd btr btt btv bva bvb bvd bvr bvt bvv daa dab dad dar dat dav dba dbb dbd dbr dbt dbv dda ddb ddd ddr ddt dra drb drd drr drt drv dta dtb dtd dtr dtt dtv dva dvb dvd dvr dvt ra- raa rab rad rar rat rav rba rbb rbd rbr rbt rda rdb rdd rdr rdt rdv rra rrb rrd rrr rrt rta rtb rtd rtr rtt rtv rva rvb rvd rvr rvt rvv taa tab tad tar tat tav tba tbb tbd tbr tbt tbv tda tdb tdd tdr tdt tdv tra trb trd trr trt trv tta ttb ttd ttr ttt ttv tva tvb tvd tvr tvt v-a vaa vab vad var vat vav vba vbd vbr vbv vdb vdd vdr vdt vdv vra vrb vrd vrr vrt vta vtb vtr vtt vtv vva vvb vvr vvt vvv