ddd ddi ddp ddr dds ddt di- did dii dip dir dis dit dpd dpi dpp dpr dps dpt drd dri drp drr drs drt dsd dsi dsp dsr dss dst dtd dti dtp dtr dts dtt i-d idd idi idp idr ids idt iid iii iip iir iis iit ipd ipi ipp ipr ips ipt ir- ird iri irp irr irs irt is- isd isi isp isr iss ist itd iti itp its itt p-p pdd pdi pdp pdr pds pdt pid pii pip pir pis pit ppd ppi ppp ppr pps ppt prd pri prp prr prs prt ps- psd psi psp psr pss pst pt- ptd pti ptp ptr pts ptt rdd rdi rdp rdr rds rdt rid rii rip rir ris rit rpd rpi rpp rpr rps rpt rrd rri rrp rrr rrs rrt rsd rsi rsp rsr rss rst rtd rti rtp rtr rts rtt sdd sdi sdp sdr sds sdt sid sii sip sir sis sit spd spi spp spr sps spt sr- srd sri srp srr srs srt ss- ssd ssi ssp ssr sss sst std sti stp str sts stt tdd tdi tdp tdr tds tdt tid tii tip tir tis tit tpd tpi tpp tpr tps tpt trd tri trp trr trs trt tsd tsi tsp tsr tss tst ttd tti ttp ttr tts ttt