ddd ddm ddo ddp dds dmd dmm dmo dmp dms dod dom doo dop dos dpd dpm dpo dpp dps dsd dsm dso dsp dss m-o mdd mdm mdo mdp mds mmd mmm mmo mmp mms mod mom moo mop mos mpd mpm mpo mpp mps msd msm mso msp mss odd odm odo odp ods om- omd omm omo omp oms oo- ood oom ooo oop oos op- opd opm opo opp ops os- osd osm oso osp oss p-p pdd pdm pdo pdp pds pmd pmm pmo pmp pms pod pom poo pop pos ppd ppm ppo ppp pps ps- psd psm pso psp pss sdd sdm sdo sdp sds smd smm smo smp sms sod som soo sop sos spd spm spo spp sps ss- ssd ssm sso ssp sss