-er b-p bbb bbe bbi bbm bbp bbr bbs be- beb bee bei bem bep ber bes bi- bib bie bii bim bip bir bis bmb bme bmi bmm bmp bmr bms bpb bpe bpi bpm bpp bpr bps brb bre bri brm brp brr brs bsb bse bsi bsm bsp bsr bss ebb ebe ebi ebm ebp ebr ebs eeb eee eem eep eer ees eib eie eii eim eip eir eis em- emb eme emi emm emp emr ems ep- epb epe epi epm epp epr eps erb ere eri erm erp err ers es- esb ese esi esm esp esr ess ibb ibe ibi ibm ibp ibr ibs ie- iee iei iem iep ier ies iib iie iii iim iip iir iis im- imb ime imi imm imp ims ipb ipe ipi ipm ipp ipr ips ir- irb ire iri irm irp irr irs is- isb ise isi ism isp isr iss m-r mbb mbe mbi mbm mbp mbr mbs meb mee mei mem mep mer mes mi- mib mie mii mim mip mir mis mmb mme mmi mmm mmp mmr mms mpb mpe mpi mpm mpp mpr mps mrb mre mri mrm mrp mrr mrs msb mse msi msm msp msr mss p-p pbb pbe pbi pbm pbp pbr pbs peb pee pei pem pep per pes pib pie pii pim pip pir pis pmb pme pmi pmm pmp pmr pms ppb ppe ppi ppm ppp ppr pps prb pre pri prm prp prr prs ps- psb pse psi psm psp psr pss rbb rbe rbi rbm rbp rbr rbs re- reb ree rei rem rep rer res rib rie rii rim rip rir ris rmb rme rmi rmm rmp rmr rms rpb rpe rpi rpm rpp rpr rps rrb rri rrm rrp rrr rrs rsb rse rsi rsm rsp rsr rss sbb sbe sbi sbm sbp sbr sbs se- seb see sei sem sep ser ses sib sie sii sim sip sir sis smb sme smi smm smp smr sms spb spe spi spm spp spr sps sr- srb sre sri srm srp srr srs ss- ssb sse ssi ssm ssp ssr sss