ddd ddi ddo ddr dds ddt ddx di- did dii dio dir dis dit dix dod doi doo dor dos dot dox drd dri dro drr drs drt drx dsd dsi dso dsr dss dst dsx dtd dti dto dtr dts dtt dtx dxd dxi dxo dxr dxs dxt dxx i-d idd idi ido idr ids idt idx iid iii iio iir iis iit iix io- iod ioi ioo ior ios iot ir- ird iri iro irr irs irt irx is- isd isi iso isr iss ist itd iti ito its itt itx ixi o-i odd odi odo odr ods odt oid oii oio oir ois oit oo- ood ooi ooo oor oos oot oox or- ord ori oro orr ors ort orx os- osd osi oso osr oss ost osx ot- otd oti oto otr ots ott ox- oxi oxo oxt oxx rdd rdi rdo rdr rds rdt rdx rid rii rio rir ris rit rix rod roi roo ror ros rot rox rrd rri rrr rrs rrt rsd rsi rso rsr rss rst rsx rtd rti rto rtr rts rtt rtx rxr rxs sdd sdi sdo sdr sds sdt sid sii sio sir sis sit six sod soi soo sor sos sot sox sr- srd sri sro srr srs srt srx ss- ssd ssi sso ssr sss sst ssx std sti sto str sts stt stx sxi sxs sxt t-x tdd tdi tdo tdr tds tdt tdx tid tii tio tir tis tit tix to- tod toi too tor tos tot tox trd tri tro trr trs trt trx tsd tsi tso tsr tss tst tsx ttd tti tto ttr tts ttt ttx txi txs txt xdi xdr xds xdt xii xio xis xit xix xod xoi xoo xor xos xot xox xrd xrt xrx xsi xss xst xti xtr xts xtx xxi xxo xxx