a-a a-t aaa aad aar aat aav ad- ada add adr adt adv ar- ara ard arr art arv at- ata atd atr att atv av- ava avd avr avt daa dad dar dat dav dda ddd ddr ddt dra drd drr drt drv dta dtd dtr dtt dtv dva dvd dvr dvt ra- raa rad rar rat rav rda rdd rdr rdt rdv rra rrd rrr rrt rta rtd rtr rtt rtv rva rvd rvr rvt rvv taa tad tar tat tav tda tdd tdr tdt tdv tra trd trr trt trv tta ttd ttr ttt ttv tva tvd tvr tvt v-a vaa vad var vat vav vdd vdr vdt vdv vra vrd vrr vrt vta vtr vtt vtv vva vvr vvt vvv