-er -ic b-p bbb bbc bbe bbi bbm bbo bbp bbr bcb bcc bce bci bcm bco bcp bcr be- beb bec bee bei bem beo bep ber bi- bib bic bie bii bim bio bip bir bmb bmc bme bmi bmm bmo bmp bmr bob boc boe boi bom boo bop bor bpb bpc bpe bpi bpm bpo bpp bpr brb bre bri brm bro brp brr c-- cbb cbc cbe cbi cbm cbo cbp cbr ccb ccc cce cci ccm cco ccp ccr ce- ceb cec cee cei cem ceo cep cer ci- cib cic cie cii cim cio cip cir cmb cmc cme cmi cmm cmo cmp cmr co- cob coc coe coi com coo cop cor cpb cpc cpe cpi cpm cpo cpp cpr crb crc cre cri crm cro crp crr ebb ebc ebe ebi ebm ebo ebp ebr ec- ecb ecc ece eci ecm eco ecr eeb eec eee eem eeo eep eer eib eic eie eii eim eio eip eir em- emb emc eme emi emm emo emp emr eo- eob eoc eoe eoi eom eoo eop eor ep- epb epc epe epi epm epo epp epr erb erc ere eri erm ero erp err ibb ibc ibe ibi ibm ibo ibp ibr icb icc ice ici icm ico icp icr ie- iec iee iei iem iep ier iib iic iie iii iim iio iip iir im- imb imc ime imi imm imo imp io- iob ioc ioe ioi iom ioo iop ior ipb ipc ipe ipi ipm ipo ipp ipr ir- irb irc ire iri irm iro irp irr m-o m-r mbb mbc mbe mbi mbm mbo mbp mbr mc- mcb mcc mce mci mcm mco mcp mcr meb mec mee mei mem meo mep mer mi- mib mic mie mii mim mio mip mir mmb mmc mme mmi mmm mmo mmp mmr mob moc moe moi mom moo mop mor mpb mpc mpe mpi mpm mpo mpp mpr mrb mrc mre mri mrm mro mrp mrr o-i ob- obb obc obe obi obm obo obp obr oc- ocb occ oci ocm oco ocp ocr oeb oec oee oei oem oeo oep oer oib oic oie oii oim oio oip oir om- omb omc ome omi omm omo omp omr oo- oob ooc ooi oom ooo oop oor op- opb opc ope opi opm opo opp opr or- orb orc ore ori orm oro orp orr p-p pbb pbc pbe pbi pbm pbo pbp pbr pcb pcc pce pci pcm pco pcp pcr peb pec pee pei pem peo pep per pib pic pie pii pim pio pip pir pmb pmc pme pmi pmm pmo pmp pmr pob poc poe poi pom poo pop por ppb ppc ppe ppi ppm ppo ppp ppr prb prc pre pri prm pro prp prr rbb rbc rbe rbi rbm rbo rbp rbr rcb rcc rce rci rcm rco rcp rcr re- reb rec ree rei rem reo rep rer rib ric rie rii rim rio rip rir rmb rmc rme rmi rmm rmo rmp rmr rob roc roe roi rom roo rop ror rpb rpc rpe rpi rpm rpo rpp rpr rrb rrc rri rrm rrp rrr