-up nnn nnp nns nnu npn npp npr nps npu nrn nrp nrr nrs nru nsn nsp nsr nss nsu nun nup nur nus nuu p-p pn- pnn pnp pnr pns pnu ppn ppp ppr pps ppu prn prp prr prs pru ps- psn psp psr pss psu pun pup pur pus puu rnn rnp rnr rns rnu rpn rpp rpr rps rpu rrn rrp rrr rrs rru rsn rsp rsr rss rsu run rup rur rus ruu snn snp snr sns snu spn spp spr sps spu sr- srn srp srr srs ss- ssn ssp ssr sss ssu sun sup sur sus suu un- unn unp unr uns unu up- upn upp upr ups upu ur- urn urp urr urs uru usn usp usr uss usu uun uur uus uuu