-er b-p bbb bbe bbi bbm bbp bbr be- beb bee bei bem bep ber bi- bib bie bii bim bip bir bmb bme bmi bmm bmp bmr bpb bpe bpi bpm bpp bpr brb bre bri brm brp brr ebb ebe ebi ebm ebp ebr eeb eee eem eep eer eib eie eii eim eip eir em- emb eme emi emm emp emr ep- epb epe epi epm epp epr erb ere eri erm erp err ibb ibe ibi ibm ibp ibr ie- iee iei iem iep ier iib iie iii iim iip iir im- imb ime imi imm imp ipb ipe ipi ipm ipp ipr ir- irb ire iri irm irp irr m-r mbb mbe mbi mbm mbp mbr meb mee mei mem mep mer mi- mib mie mii mim mip mir mmb mme mmi mmm mmp mmr mpb mpe mpi mpm mpp mpr mrb mre mri mrm mrp mrr p-p pbb pbe pbi pbm pbp pbr peb pee pei pem pep per pib pie pii pim pip pir pmb pme pmi pmm pmp pmr ppb ppe ppi ppm ppp ppr prb pre pri prm prp prr rbb rbe rbi rbm rbp rbr re- reb ree rei rem rep rer rib rie rii rim rip rir rmb rme rmi rmm rmp rmr rpb rpe rpi rpm rpp rpr rrb rri rrm rrp rrr