ddd ddi ddo dds ddt ddx di- did dii dio dis dit dix dod doi doo dos dot dox dsd dsi dso dss dst dsx dtd dti dto dts dtt dtx dxd dxi dxo dxs dxt dxx i-d idd idi ido ids idt idx iid iii iio iis iit iix io- iod ioi ioo ios iot is- isd isi iso iss ist itd iti ito its itt itx ixi o-i odd odi odo ods odt oid oii oio ois oit oo- ood ooi ooo oos oot oox os- osd osi oso oss ost osx ot- otd oti oto ots ott ox- oxi oxo oxt oxx sdd sdi sdo sds sdt sid sii sio sis sit six sod soi soo sos sot sox ss- ssd ssi sso sss sst ssx std sti sto sts stt stx sxi sxs sxt t-x tdd tdi tdo tds tdt tdx tid tii tio tis tit tix to- tod toi too tos tot tox tsd tsi tso tss tst tsx ttd tti tto tts ttt ttx txi txs txt xdi xds xdt xii xio xis xit xix xod xoi xoo xos xot xox xsi xss xst xti xts xtx xxi xxo xxx