-up fff ffp ffr ffs ffu fpp fpr fps fpu frf frp frr frs fru fsf fsp fsr fss fsu fuf fup fur fus fuu p-p pff pfp pfr pfs pfu ppf ppp ppr pps ppu prf prp prr prs pru ps- psf psp psr pss psu puf pup pur pus puu rff rfp rfr rfs rfu rpf rpp rpr rps rpu rrf rrp rrr rrs rru rsf rsp rsr rss rsu ruf rup rur rus ruu sff sfp sfr sfs sfu spf spp spr sps spu sr- srf srp srr srs ss- ssf ssp ssr sss ssu suf sup sur sus suu uff ufp ufr ufs ufu up- upf upp upr ups upu ur- urf urp urr urs uru usf usp usr uss usu uur uus uuu