ddd ddm ddo ddr dds ddt dmd dmm dmo dmr dms dmt dod dom doo dor dos dot drd drm dro drr drs drt dsd dsm dso dsr dss dst dtd dtm dto dtr dts dtt m-o m-r mdd mdm mdo mdr mds mdt mmd mmm mmo mmr mms mmt mod mom moo mor mos mot mrd mrm mro mrr mrs mrt msd msm mso msr mss mst mtd mtm mto mtr mts mtt odd odm odo odr ods odt om- omd omm omo omr oms omt oo- ood oom ooo oor oos oot or- ord orm oro orr ors ort os- osd osm oso osr oss ost ot- otd otm oto otr ots ott rdd rdm rdo rdr rds rdt rmd rmm rmo rmr rms rmt rod rom roo ror ros rot rrd rrm rrr rrs rrt rsd rsm rso rsr rss rst rtd rtm rto rtr rts rtt sdd sdm sdo sdr sds sdt smd smm smo smr sms smt sod som soo sor sos sot sr- srd srm sro srr srs srt ss- ssd ssm sso ssr sss sst std stm sto str sts stt tdd tdm tdo tdr tds tdt tmd tmm tmo tmr tms tmt to- tod tom too tor tos tot trd trm tro trr trs trt tsd tsm tso tsr tss tst ttd ttm tto ttr tts ttt