a-a a-t aaa aad aas aat aax ad- ada add ads adt adx as- asa asd ass ast asx at- ata atd ats att atx ax- axa axs axt axx daa dad das dat dax dda ddd dds ddt ddx dsa dsd dss dst dsx dta dtd dts dtt dtx dxd dxs dxt dxx saa sad sas sat sax sda sdd sds sdt ss- ssa ssd sss sst ssx sta std sts stt stx sxs sxt t-x taa tad tas tat tax tda tdd tds tdt tdx tsa tsd tss tst tsx tta ttd tts ttt ttx txs txt xaa xad xas xat xda xds xdt xsa xss xst xts xtx xxx