a-a a-t aaa aad aar aas aat aax ad- ada add adr ads adt adx ar- ara ard arr ars art arx as- asa asd asr ass ast asx at- ata atd atr ats att atx ax- axa axr axs axt axx daa dad dar das dat dax dda ddd ddr dds ddt ddx dra drd drr drs drt drx dsa dsd dsr dss dst dsx dta dtd dtr dts dtt dtx dxd dxr dxs dxt dxx ra- raa rad rar ras rat rax rda rdd rdr rds rdt rdx rra rrd rrr rrs rrt rsa rsd rsr rss rst rsx rta rtd rtr rts rtt rtx rxr rxs saa sad sar sas sat sax sda sdd sdr sds sdt sr- sra srd srr srs srt srx ss- ssa ssd ssr sss sst ssx sta std str sts stt stx sxs sxt t-x taa tad tar tas tat tax tda tdd tdr tds tdt tdx tra trd trr trs trt trx tsa tsd tsr tss tst tsx tta ttd ttr tts ttt ttx txs txt xaa xad xar xas xat xda xdr xds xdt xrd xrt xrx xsa xss xst xtr xts xtx xxx