ddd ddi ddp ddr dds di- did dii dip dir dis dpd dpi dpp dpr dps drd dri drp drr drs dsd dsi dsp dsr dss i-d idd idi idp idr ids iid iii iip iir iis ipd ipi ipp ipr ips ir- ird iri irp irr irs is- isd isi isp isr iss p-p pdd pdi pdp pdr pds pid pii pip pir pis ppd ppi ppp ppr pps prd pri prp prr prs ps- psd psi psp psr pss rdd rdi rdp rdr rds rid rii rip rir ris rpd rpi rpp rpr rps rrd rri rrp rrr rrs rsd rsi rsp rsr rss sdd sdi sdp sdr sds sid sii sip sir sis spd spi spp spr sps sr- srd sri srp srr srs ss- ssd ssi ssp ssr sss