a-a a-t aaa aad aan aar aat ad- ada add adn adr adt an- ana and ann anr ant ar- ara ard arn arr art at- ata atd atn atr att daa dad dan dar dat dda ddd ddn ddr ddt dna dnd dnn dnr dnt dra drd drn drr drt dta dtd dtn dtr dtt naa nad nan nar nat nda ndd ndn ndr ndt nna nnn nnt nra nrd nrn nrr nrt nta ntd ntn ntr ntt ra- raa rad ran rar rat rda rdd rdn rdr rdt rna rnd rnn rnr rnt rra rrd rrn rrr rrt rta rtd rtn rtr rtt taa tad tan tar tat tda tdd tdn tdr tdt tna tnd tnn tnr tnt tra trd trn trr trt tta ttd ttn ttr ttt