rrp rrr rrs rsb rsd rse rsi rsl rsn rso rsp rsr rss rzb rze rzo sbb sbd sbe sbi sbl sbn sbo sbp sbr sbs sdb sdd sde sdi sdl sdn sdo sdp sdr sds sdz se- seb sed see sei sel sen seo sep ser ses sez sib sid sie sii sil sin sio sip sir sis slb sld sle sli sll sln slo slp slr sls snb snd sne sni snl snn sno snp snr sns sob sod soe soi sol son soo sop sor sos soz spb spd spe spi spl spn spo spp spr sps spz sr- srb srd sre sri srl srn sro srp srr srs ss- ssb ssd sse ssi ssl ssn sso ssp ssr sss ssz szd sze szi szl szp szr zbb zbl zbr zbs zds zeb zed zee zel zen zeo zep zer zes zez zib zid zie zil zin zio zip zir zis ziz zlr znd zne znn zno znp zns zo- zob zod zoe zoi zol zon zoo zor zos zpe zpi zpl zpo zpp zpr zrl zro zrp zrs zse zsi zsl zsz zzr zzs zzz