ddd ddk ddr dds ddt ddx dkk dkr dks dkt dkx drd drk drr drs drt drx dsd dsk dsr dss dst dsx dtd dtk dtr dts dtt dtx dxd dxr dxs dxt dxx k-t kdk kdr kds kdt kdx kkk kkr kks kkt krd krk krr krs krt ksd ksk ksr kss kst ktk ktr kts ktt rdd rdr rds rdt rdx rkk rks rkt rrd rrk rrr rrs rrt rsd rsk rsr rss rst rsx rtd rtk rtr rts rtt rtx rxr rxs sdd sdk sdr sds sdt sk- skd skk skr sks skt skx sr- srd srk srr srs srt srx ss- ssd ssk ssr sss sst ssx std stk str sts stt stx sxs sxt t-x tdd tdk tdr tds tdt tdx tkk tkr tks tkt trd trk trr trs trt trx tsd tsk tsr tss tst tsx ttd ttk ttr tts ttt ttx txk txs txt xdk xdr xds xdt xks xrd xrt xrx xss xst xtr xts xtx xxx