ddd ddf ddg ddo dds ddt dfd dff dfg dfo dfs dft dgd dgf dgg dgs dgt dod dof dog doo dos dot dsd dsf dsg dso dss dst dtd dtf dtg dto dts dtt fdd fdf fdg fdo fds fdt ffd fff ffg ffo ffs fft fgd fgf fgg fgs fgt fof fog foo fos fot fsd fsf fsg fso fss fst ftd ftf ftg fto fts ftt g-d gdd gdf gdo gds gdt gfd gff gfo gfs gft ggd ggg ggo ggs ggt god gof gog goo gos got gsd gsf gsg gso gss gst gtd gtf gtg gto gts gtt odd odf odg odo ods odt of- ofd off ofg ofo ofs oft ogd ogf ogg ogo ogs ogt oo- ood oof oog ooo oos oot os- osd osf osg oso oss ost ot- otd otf otg oto ots ott sdd sdf sdg sdo sds sdt sfd sff sfg sfo sfs sft sgd sgf sgg sgo sgs sgt sod sof sog soo sos sot ss- ssd ssf ssg sso sss sst std stf stg sto sts stt tdd tdf tdg tdo tds tdt tfd tff tfg tfo tfs tft tgf tgg tgo tgs tgt to- tod tof tog too tos tot tsd tsf tsg tso tss tst ttd ttf ttg tto tts ttt