ddd ddn ddo dds ddt ddx dnd dnn dno dns dnt dod don doo dos dot dox dsd dsn dso dss dst dsx dtd dtn dto dts dtt dtx dxd dxn dxo dxs dxt dxx ndd ndn ndo nds ndt nnn nno nns nnt no- nod non noo nos not nox nsd nsn nso nss nst nsx ntd ntn nto nts ntt ntx nxd nxt odd odn odo ods odt on- ond onn ono ons ont onx oo- ood oon ooo oos oot oox os- osd osn oso oss ost osx ot- otd otn oto ots ott ox- oxn oxo oxt oxx sdd sdn sdo sds sdt snd snn sno sns snt sod son soo sos sot sox ss- ssd ssn sso sss sst ssx std stn sto sts stt stx sxn sxs sxt t-x tdd tdn tdo tds tdt tdx tnd tnn tno tns tnt tnx to- tod ton too tos tot tox tsd tsn tso tss tst tsx ttd ttn tto tts ttt ttx txn txs txt xds xdt xno xns xod xon xoo xos xot xox xss xst xts xtx xxo xxx