ddd ddf ddo ddp ddr dds ddt dfd dff dfo dfp dfr dfs dft dod dof doo dop dor dos dot dpd dpf dpo dpp dpr dps dpt drd dro drp drr drs drt dsd dsf dso dsp dsr dss dst dtd dtf dto dtp dtr dts dtt fdd fdf fdo fdp fdr fds fdt ffd fff ffo ffp ffr ffs fft fof foo fop for fos fot fpd fpo fpp fpr fps fpt frd frf fro frp frr frs frt fsd fsf fso fsp fsr fss fst ftd ftf fto ftp ftr fts ftt odd odf odo odp odr ods odt of- ofd off ofo ofp ofr ofs oft oo- ood oof ooo oop oor oos oot op- opd opf opo opp opr ops opt or- ord orf oro orp orr ors ort os- osd osf oso osp osr oss ost ot- otd otf oto otp otr ots ott p-p pdd pdf pdo pdp pdr pds pdt pfd pff pfo pfp pfr pfs pft pod pof poo pop por pos pot ppd ppf ppo ppp ppr pps ppt prd prf pro prp prr prs prt ps- psd psf pso psp psr pss pst pt- ptd ptf pto ptp ptr pts ptt rdd rdf rdo rdp rdr rds rdt rfd rff rfo rfp rfr rfs rft rod rof roo rop ror ros rot rpd rpf rpo rpp rpr rps rpt rrd rrf rrp rrr rrs rrt rsd rsf rso rsp rsr rss rst rtd rtf rto rtp rtr rts rtt sdd sdf sdo sdp sdr sds sdt sfd sff sfo sfp sfr sfs sft sod sof soo sop sor sos sot spd spf spo spp spr sps spt sr- srd srf sro srp srr srs srt ss- ssd ssf sso ssp ssr sss sst std stf sto stp str sts stt tdd tdf tdo tdp tdr tds tdt tfd tff tfo tfp tfr tfs tft to- tod tof too top tor tos tot tpd tpf tpo tpp tpr tps tpt trd trf tro trp trr trs trt tsd tsf tso tsp tsr tss tst ttd ttf tto ttp ttr tts ttt