-er b-p bbb bbe bbg bbo bbp bbr bbs be- beb bee beg beo bep ber bes bez bgb bge bgg bgo bgp bgr bgs bgz bob boe bog boo bop bor bos boz bpb bpe bpg bpo bpp bpr bps brb bre brg bro brp brr brs brz bsb bse bsg bso bsp bsr bss bze bzo bzp bzr bzs bzz ebb ebe ebg ebo ebp ebr ebs eeb eee eeg eeo eep eer ees egb ege egg ego egp egr egs eo- eob eoe eog eoo eop eor eos ep- epb epe epg epo epp epr eps epz erb ere erg ero erp err ers erz es- esb ese esg eso esp esr ess eze ezo ezr ezs ezz g-p gbe gbg gbo gbp gbr gbs gbz ge- geb gee geg geo gep ger ges gez ggb ggg ggo ggp ggr ggs ggz gob goe gog goo gop gor gos goz gpb gpe gpg gpo gpp gpr gps gpz grb gre grg gro grp grr grs gsb gse gsg gso gsp gsr gss gzo gzp gzr ob- obb obe obg obo obp obr obs oeb oee oeg oeo oep oer oes oge ogg ogo ogp ogs oo- oob oog ooo oop oor oos op- opb ope opg opo opp opr ops or- orb ore org oro orp orr ors orz os- osb ose osg oso osp osr oss oze ozo ozs ozz p-p pbb pbe pbg pbo pbp pbr pbs pbz peb pee peg peo pep per pes pez pgb pge pgg pgo pgp pgr pgs pob poe pog poo pop por pos poz ppb ppe ppg ppo ppp ppr pps ppz prb pre prg pro prp prr prs prz ps- psb pse psg pso psp psr pss pzp rbb rbe rbg rbo rbp rbr rbs re- reb ree reg reo rep rer res rez rgb rge rgg rgo rgp rgr rgs rob roe rog roo rop ror ros roz rpb rpe rpg rpo rpp rpr rps rpz rrb rrg rrp rrr rrs rsb rse rsg rso rsp rsr rss rzb rze rzo sbb sbe sbg sbo sbp sbr sbs se- seb see seg seo sep ser ses sez sgb sge sgg sgo sgp sgr sgs sob soe sog soo sop sor sos soz spb spe spg spo spp spr sps spz sr- srb sre srg sro srp srr srs ss- ssb sse ssg sso ssp ssr sss ssz sze szp szr z-g zbb zbr zbs zeb zee zeo zep zer zes zez zgb zgg zgs zo- zob zoe zog zoo zor zos zpe zpg zpo zpp zpr zro zrp zrs zse zsg zsz zzr zzs zzz