rpm rpo rpp rpr rps rrb rrc rrg rrh rri rrm rrp rrr rrs rsb rsc rsg rsh rsi rsm rso rsp rsr rss ry- ryc ryg rym ryo ryr rys ryy sbb sbc sbg sbh sbi sbm sbo sbp sbr sbs sby scb scc scg sch sci scm sco scp scr scs sgb sgc sgg sgh sgi sgm sgo sgp sgr sgs sh- shb shc shg shh shi shm sho shp shr shs shy sib sic sig sih sii sim sio sip sir sis smb smc smg smh smi smm smo smp smr sms smy sob soc sog soh soi som soo sop sor sos soy spb spc spg sph spi spm spo spp spr sps spy sr- srb src srg srh sri srm sro srp srr srs sry ss- ssb ssc ssg ssh ssi ssm sso ssp ssr sss sy- syb syc syg syh syi sym syp syr sys ybc ybg ybi ybm ybp ybr ybs yby ycc ych yci yco ycp ycs ycy ygc ygm ygo yhc yhi yhs yig yih yii yim yio yip yir yis ymc ymg ymi ymm ymo yms yob yoc yog yoi yom yoo yop yor yos yoy ypg ypo yps yrc yrg yro yrp yrs ysb ysc ysg ysi ysm yso ysp ysr yss ysy yyb yyc yyg yys yyy