-up ddd ddi ddp ddr dds ddu di- did dii dip dir dis diu dpd dpi dpp dpr dps dpu drd dri drp drr drs dru dsd dsi dsp dsr dss dsu dud dui dup dur dus i-d idd idi idp idr ids idu iid iii iip iir iis iiu ipd ipi ipp ipr ips ipu ir- ird iri irp irr irs iru is- isd isi isp isr iss isu iu- iud iui iup iur ius p-p pdd pdi pdp pdr pds pdu pid pii pip pir pis piu ppd ppi ppp ppr pps ppu prd pri prp prr prs pru ps- psd psi psp psr pss psu pud pui pup pur pus puu rdd rdi rdp rdr rds rdu rid rii rip rir ris rpd rpi rpp rpr rps rpu rrd rri rrp rrr rrs rru rsd rsi rsp rsr rss rsu rud rui rup rur rus ruu sdd sdi sdp sdr sds sdu sid sii sip sir sis siu spd spi spp spr sps spu sr- srd sri srp srr srs ss- ssd ssi ssp ssr sss ssu sud sui sup sur sus suu udd udi udp udr uds udu uid uii uip uir uis uiu up- upd upi upp upr ups upu ur- urd uri urp urr urs uru usd usi usp usr uss usu uur uus uuu