ddd ddm ddo dds ddx dmd dmm dmo dms dmx dod dom doo dos dox dsd dsm dso dss dsx dxd dxo dxs dxx m-o mdd mdm mdo mds mdx mmd mmm mmo mms mmx mod mom moo mos mox msd msm mso mss msx mxd mxs odd odm odo ods om- omd omm omo oms omx oo- ood oom ooo oos oox os- osd osm oso oss osx ox- oxo oxx sdd sdm sdo sds smd smm smo sms smx sod som soo sos sox ss- ssd ssm sso sss ssx sxm sxs xdm xds xmd xmm xmo xms xmx xod xom xoo xos xox xsm xss xxo xxx