a-a a-t aaa aad aan aar aat aax ad- ada add adn adr adt adx an- ana and ann anr ant anx ar- ara ard arn arr art arx at- ata atd atn atr att atx ax- axa axn axr axt axx daa dad dan dar dat dax dda ddd ddn ddr ddt ddx dna dnd dnn dnr dnt dra drd drn drr drt drx dta dtd dtn dtr dtt dtx dxd dxn dxr dxt dxx naa nad nan nar nat nax nda ndd ndn ndr ndt nna nnn nnt nra nrd nrn nrr nrt nrx nta ntd ntn ntr ntt ntx nxd nxt ra- raa rad ran rar rat rax rda rdd rdn rdr rdt rdx rna rnd rnn rnr rnt rra rrd rrn rrr rrt rta rtd rtn rtr rtt rtx rxr t-x taa tad tan tar tat tax tda tdd tdn tdr tdt tdx tna tnd tnn tnr tnt tnx tra trd trn trr trt trx tta ttd ttn ttr ttt ttx txn txt xaa xad xan xar xat xda xdr xdt xna xrd xrt xrx xtr xtx xxx