rpk rpn rpo rpp rpr rps rpu rra rrf rrg rri rrk rrn rrp rrr rrs rru rsa rsf rsg rsi rsk rsn rso rsp rsr rss rsu rua ruf rug rui ruk run ruo rup rur rus ruu saa saf sag sai sak san sao sap sar sas sau sfa sff sfg sfi sfk sfn sfo sfp sfr sfs sfu sga sgf sgg sgi sgk sgn sgo sgp sgr sgs sgu sia sif sig sii sik sin sio sip sir sis siu sk- ska skf skg ski skk sko skp skr sks sku sna snf sng sni snk snn sno snp snr sns snu soa sof sog soi sok son soo sop sor sos sou spa spf spg spi spk spn spo spp spr sps spu sr- sra srf srg sri srk srn sro srp srr srs ss- ssa ssf ssg ssi ssk ssn sso ssp ssr sss ssu sua suf sug sui suk sun suo sup sur sus suu ua- uaa uaf uag uai uak uan uao uap uar uas uau ufa uff ufg ufi ufn ufo ufp ufr ufs ufu uga ugf ugg ugi ugk ugn ugo ugp ugr ugs ugu uia uif uig uii uin uio uip uir uis uiu uka ukf uki ukk ukn ukp ukr uku un- una unf ung uni unk unn uno unp unr uns unu uoa uog uok uon uoo uop uor uos up- upa upf upg upi upk upn upo upp upr ups upu ur- ura urf urg uri urk urn uro urp urr urs uru usa usf usg usi usk usn uso usp usr uss usu uua uug uun uur uus uuu