ddd ddf ddn ddo dds ddt dfd dff dfn dfo dfs dft dnd dnf dnn dno dns dnt dod dof don doo dos dot dsd dsf dsn dso dss dst dtd dtf dtn dto dts dtt fdd fdf fdn fdo fds fdt ffd fff ffn ffo ffs fft fnd fnf fnn fns fnt fof fon foo fos fot fsd fsf fsn fso fss fst ftd ftf ftn fto fts ftt ndd ndf ndn ndo nds ndt nfd nff nfn nfo nfs nft nnf nnn nno nns nnt no- nod nof non noo nos not nsd nsf nsn nso nss nst ntd ntf ntn nto nts ntt odd odf odn odo ods odt of- ofd off ofn ofo ofs oft on- ond onf onn ono ons ont oo- ood oof oon ooo oos oot os- osd osf osn oso oss ost ot- otd otf otn oto ots ott sdd sdf sdn sdo sds sdt sfd sff sfn sfo sfs sft snd snf snn sno sns snt sod sof son soo sos sot ss- ssd ssf ssn sso sss sst std stf stn sto sts stt tdd tdf tdn tdo tds tdt tfd tff tfn tfo tfs tft tnd tnf tnn tno tns tnt to- tod tof ton too tos tot tsd tsf tsn tso tss tst ttd ttf ttn tto tts ttt