-up iii iip iir iis iiu ipi ipp ipr ips ipu ir- iri irp irr irs iru is- isi isp isr iss isu iu- iui iup iur ius p-p pii pip pir pis piu ppi ppp ppr pps ppu pri prp prr prs pru ps- psi psp psr pss psu pui pup pur pus puu rii rip rir ris rpi rpp rpr rps rpu rri rrp rrr rrs rru rsi rsp rsr rss rsu rui rup rur rus ruu sii sip sir sis siu spi spp spr sps spu sr- sri srp srr srs ss- ssi ssp ssr sss ssu sui sup sur sus suu uii uip uir uis uiu up- upi upp upr ups upu ur- uri urp urr urs uru usi usp usr uss usu uur uus uuu