rpi rpn rpo rpp rpr rps rpz rra rrd rrg rri rrn rrp rrr rrs rsa rsd rse rsg rsi rsn rso rsp rsr rss rza rze rzo saa sad sae sag sai san sao sap sar sas saz sda sdd sde sdg sdi sdn sdo sdp sdr sds sdz se- sea sed see seg sei sen seo sep ser ses sez sga sgd sge sgg sgi sgn sgo sgp sgr sgs sia sid sie sig sii sin sio sip sir sis sna snd sne sng sni snn sno snp snr sns soa sod soe sog soi son soo sop sor sos soz spa spd spe spg spi spn spo spp spr sps spz sr- sra srd sre srg sri srn sro srp srr srs ss- ssa ssd sse ssg ssi ssn sso ssp ssr sss ssz sza szd sze szi szp szr z-g zaa zad zag zai zan zao zap zar zas zaz zds zea zed zee zen zeo zep zer zes zez zgg zgi zgs zia zid zie zig zin zio zip zir zis ziz znd zne znn zno znp zns zo- zoa zod zoe zog zoi zon zoo zor zos zpe zpg zpi zpo zpp zpr zro zrp zrs zsa zse zsg zsi zsz zzr zzs zzz