ddd ddf ddk ddm ddo dds dfd dff dfk dfm dfo dfs dkk dkm dko dks dmd dmf dmk dmm dmo dms dod dof dok dom doo dos dsd dsf dsk dsm dso dss fdd fdf fdk fdm fdo fds ffd fff ffk ffm ffo ffs fkf fkk fkm fmd fmf fmm fmo fms fof fok fom foo fos fsd fsf fsk fsm fso fss kdf kdk kdm kdo kds kfd kff kfm kfo kfs kkk kkm kks kmd kmf kmk kmm kmo kms kod kof kok kom koo kos ksd ksf ksk ksm kso kss m-f m-o mdd mdf mdk mdm mdo mds mfd mff mfm mfo mfs mkd mkk mkm mko mks mmd mmf mmk mmm mmo mms mod mof mok mom moo mos msd msf msk msm mso mss odd odf odm odo ods of- ofd off ofm ofo ofs okd okk oko oks om- omd omf omm omo oms oo- ood oof ook oom ooo oos os- osd osf osk osm oso oss sdd sdf sdk sdm sdo sds sfd sff sfk sfm sfo sfs sk- skd skf skk skm sko sks smd smf smk smm smo sms sod sof sok som soo sos ss- ssd ssf ssk ssm sso sss