b-p bbb bbi bbm bbp bbr bbs bi- bib bii bim bip bir bis bmb bmi bmm bmp bmr bms bpb bpi bpm bpp bpr bps brb bri brm brp brr brs bsb bsi bsm bsp bsr bss ibb ibi ibm ibp ibr ibs iib iii iim iip iir iis im- imb imi imm imp ims ipb ipi ipm ipp ipr ips ir- irb iri irm irp irr irs is- isb isi ism isp isr iss m-r mbb mbi mbm mbp mbr mbs mi- mib mii mim mip mir mis mmb mmi mmm mmp mmr mms mpb mpi mpm mpp mpr mps mrb mri mrm mrp mrr mrs msb msi msm msp msr mss p-p pbb pbi pbm pbp pbr pbs pib pii pim pip pir pis pmb pmi pmm pmp pmr pms ppb ppi ppm ppp ppr pps prb pri prm prp prr prs ps- psb psi psm psp psr pss rbb rbi rbm rbp rbr rbs rib rii rim rip rir ris rmb rmi rmm rmp rmr rms rpb rpi rpm rpp rpr rps rrb rri rrm rrp rrr rrs rsb rsi rsm rsp rsr rss sbb sbi sbm sbp sbr sbs sib sii sim sip sir sis smb smi smm smp smr sms spb spi spm spp spr sps sr- srb sri srm srp srr srs ss- ssb ssi ssm ssp ssr sss