-er b-p bbb bbc bbe bbh bbm bbo bbp bbr bcb bcc bce bch bcm bco bcp bcr be- beb bec bee beh bem beo bep ber bhb bhc bhe bhh bhm bho bhp bhr bmb bmc bme bmh bmm bmo bmp bmr bob boc boe boh bom boo bop bor bpb bpc bpe bph bpm bpo bpp bpr brb bre brh brm bro brp brr c-- cbb cbc cbe cbh cbm cbo cbp cbr ccb ccc cce cch ccm cco ccp ccr ce- ceb cec cee ceh cem ceo cep cer ch- chb chc che chh chm cho chp chr cmb cmc cme cmh cmm cmo cmp cmr co- cob coc coe coh com coo cop cor cpb cpc cpe cph cpm cpo cpp cpr crb crc cre crh crm cro crp crr ebb ebc ebe ebh ebm ebo ebp ebr ec- ecb ecc ece ech ecm eco ecr eeb eec eee eem eeo eep eer ehb ehc ehe ehh ehm eho ehp ehr em- emb emc eme emh emm emo emp emr eo- eob eoc eoe eoh eom eoo eop eor ep- epb epc epe eph epm epo epp epr erb erc ere erh erm ero erp err hbb hbc hbe hbh hbm hbo hbp hbr hcb hcc hce hch hcm hco hcp hcr he- heb hec hee heh hem heo hep her hhb hhc hhe hhh hhm hho hhp hhr hmb hmc hme hmh hmm hmo hmp hmr hob hoc hoe hoh hom hoo hop hor hpb hpc hpe hph hpm hpo hpp hpr hr- hrb hrc hre hrh hrm hro hrp hrr m-o m-r mbb mbc mbe mbh mbm mbo mbp mbr mc- mcb mcc mce mch mcm mco mcp mcr meb mec mee meh mem meo mep mer mhc mhh mhm mho mhp mhr mmb mmc mme mmh mmm mmo mmp mmr mob moc moe moh mom moo mop mor mpb mpc mpe mph mpm mpo mpp mpr mrb mrc mre mrh mrm mro mrp mrr ob- obb obc obe obh obm obo obp obr oc- ocb occ och ocm oco ocp ocr oeb oec oee oeh oem oeo oep oer ohc ohe ohh ohm oho ohp ohr om- omb omc ome omh omm omo omp omr oo- oob ooc ooh oom ooo oop oor op- opb opc ope oph opm opo opp opr or- orb orc ore orh orm oro orp orr p-p pbb pbc pbe pbm pbo pbp pbr pcb pcc pce pch pcm pco pcp pcr peb pec pee peh pem peo pep per phb phc phe phm pho php phr pmb pmc pme pmh pmm pmo pmp pmr pob poc poe poh pom poo pop por ppb ppc ppe pph ppm ppo ppp ppr prb prc pre prh prm pro prp prr rbb rbc rbe rbh rbm rbo rbp rbr rcb rcc rce rch rcm rco rcp rcr re- reb rec ree reh rem reo rep rer rh- rhb rhc rhe rhh rhm rho rhp rhr rmb rmc rme rmh rmm rmo rmp rmr rob roc roe roh rom roo rop ror rpb rpc rpe rph rpm rpo rpp rpr rrb rrc rrh rrm rrp rrr