-er b-p bbb bbe bbk bbm bbo bbp bbr be- beb bee bek bem beo bep ber bkb bke bkk bkm bko bkp bkr bmb bme bmk bmm bmo bmp bmr bob boe bok bom boo bop bor bpb bpe bpm bpo bpp bpr brb bre brk brm bro brp brr ebb ebe ebk ebm ebo ebp ebr eeb eee eek eem eeo eep eer ekb eke eko ekp ekr em- emb eme emk emm emo emp emr eo- eob eoe eok eom eoo eop eor ep- epb epe epm epo epp epr erb ere erk erm ero erp err kbb kbe kbk kbm kbo kbp kbr ke- keb kee kek kem keo kep ker kkb kke kkk kkm kkp kkr kmb kme kmk kmm kmo kmp kob koe kok kom koo kop kor kpe kpk kpm kpo kpp kpr krk kro krp krr m-o m-r mbb mbe mbk mbm mbo mbp mbr meb mee mek mem meo mep mer mkb mke mkk mkm mko mkp mkr mmb mme mmk mmm mmo mmp mmr mob moe mok mom moo mop mor mpb mpe mpk mpm mpo mpp mpr mrb mre mrk mrm mro mrp mrr ob- obb obe obk obm obo obp obr oeb oee oem oeo oep oer okb oke okk oko okp okr om- omb ome omm omo omp omr oo- oob ook oom ooo oop oor op- opb ope opk opm opo opp opr or- orb ore ork orm oro orp orr p-p pbb pbe pbk pbm pbo pbp pbr peb pee pek pem peo pep per pkb pke pkm pko pkp pkr pmb pme pmk pmm pmo pmp pmr pob poe pok pom poo pop por ppb ppe ppk ppm ppo ppp ppr prb pre prk prm pro prp prr rbb rbe rbk rbm rbo rbp rbr re- reb ree rek rem reo rep rer rkb rke rkk rkm rko rkp rmb rme rmm rmo rmp rmr rob roe rok rom roo rop ror rpb rpe rpk rpm rpo rpp rpr rrb rrk rrm rrp rrr