ddd ddi ddo ddp ddr dds ddt di- did dii dio dip dir dis dit dod doi doo dop dor dos dot dpd dpi dpo dpp dpr dps dpt drd dri dro drp drr drs drt dsd dsi dso dsp dsr dss dst dtd dti dto dtp dtr dts dtt i-d idd idi ido idp idr ids idt iid iii iio iip iir iis iit io- iod ioi ioo iop ior ios iot ipd ipi ipo ipp ipr ips ipt ir- ird iri iro irp irr irs irt is- isd isi iso isp isr iss ist itd iti ito itp its itt o-i odd odi odo odp odr ods odt oid oii oio oip oir ois oit oo- ood ooi ooo oop oor oos oot op- opd opi opo opp opr ops opt or- ord ori oro orp orr ors ort os- osd osi oso osp osr oss ost ot- otd oti oto otp otr ots ott p-p pdd pdi pdo pdp pdr pds pdt pid pii pio pip pir pis pit pod poi poo pop por pos pot ppd ppi ppo ppp ppr pps ppt prd pri pro prp prr prs prt ps- psd psi pso psp psr pss pst pt- ptd pti pto ptp ptr pts ptt rdd rdi rdo rdp rdr rds rdt rid rii rio rip rir ris rit rod roi roo rop ror ros rot rpd rpi rpo rpp rpr rps rpt rrd rri rrp rrr rrs rrt rsd rsi rso rsp rsr rss rst rtd rti rto rtp rtr rts rtt sdd sdi sdo sdp sdr sds sdt sid sii sio sip sir sis sit sod soi soo sop sor sos sot spd spi spo spp spr sps spt sr- srd sri sro srp srr srs srt ss- ssd ssi sso ssp ssr sss sst std sti sto stp str sts stt tdd tdi tdo tdp tdr tds tdt tid tii tio tip tir tis tit to- tod toi too top tor tos tot tpd tpi tpo tpp tpr tps tpt trd tri tro trp trr trs trt tsd tsi tso tsp tsr tss tst ttd tti tto ttp ttr tts ttt