ddd ddm ddo ddp ddr dds dmd dmm dmo dmp dmr dms dod dom doo dop dor dos dpd dpm dpo dpp dpr dps drd drm dro drp drr drs dsd dsm dso dsp dsr dss m-o m-r mdd mdm mdo mdp mdr mds mmd mmm mmo mmp mmr mms mod mom moo mop mor mos mpd mpm mpo mpp mpr mps mrd mrm mro mrp mrr mrs msd msm mso msp msr mss odd odm odo odp odr ods om- omd omm omo omp omr oms oo- ood oom ooo oop oor oos op- opd opm opo opp opr ops or- ord orm oro orp orr ors os- osd osm oso osp osr oss p-p pdd pdm pdo pdp pdr pds pmd pmm pmo pmp pmr pms pod pom poo pop por pos ppd ppm ppo ppp ppr pps prd prm pro prp prr prs ps- psd psm pso psp psr pss rdd rdm rdo rdp rdr rds rmd rmm rmo rmp rmr rms rod rom roo rop ror ros rpd rpm rpo rpp rpr rps rrd rrm rrp rrr rrs rsd rsm rso rsp rsr rss sdd sdm sdo sdp sdr sds smd smm smo smp smr sms sod som soo sop sor sos spd spm spo spp spr sps sr- srd srm sro srp srr srs ss- ssd ssm sso ssp ssr sss