ddd ddm ddo ddr ddt dmd dmm dmo dmr dmt dod dom doo dor dot drd drm dro drr drt dtd dtm dto dtr dtt m-o m-r mdd mdm mdo mdr mdt mmd mmm mmo mmr mmt mod mom moo mor mot mrd mrm mro mrr mrt mtd mtm mto mtr mtt odd odm odo odr odt om- omd omm omo omr omt oo- ood oom ooo oor oot or- ord orm oro orr ort ot- otd otm oto otr ott rdd rdm rdo rdr rdt rmd rmm rmo rmr rmt rod rom roo ror rot rrd rrm rrr rrt rtd rtm rto rtr rtt tdd tdm tdo tdr tdt tmd tmm tmo tmr tmt to- tod tom too tor tot trd trm tro trr trt ttd ttm tto ttr ttt