a-a aaa aad aar aas aax ad- ada add adr ads adx ar- ara ard arr ars arx as- asa asd asr ass asx ax- axa axr axs axx daa dad dar das dax dda ddd ddr dds ddx dra drd drr drs drx dsa dsd dsr dss dsx dxd dxr dxs dxx ra- raa rad rar ras rax rda rdd rdr rds rdx rra rrd rrr rrs rsa rsd rsr rss rsx rxr rxs saa sad sar sas sax sda sdd sdr sds sr- sra srd srr srs srx ss- ssa ssd ssr sss ssx sxs xaa xad xar xas xda xdr xds xrd xrx xsa xss xxx