b-p bbb bbm bbp bbr bbs bmb bmm bmp bmr bms bpb bpm bpp bpr bps brb brm brp brr brs bsb bsm bsp bsr bss m-r mbb mbm mbp mbr mbs mmb mmm mmp mmr mms mpb mpm mpp mpr mps mrb mrm mrp mrr mrs msb msm msp msr mss p-p pbb pbm pbp pbr pbs pmb pmm pmp pmr pms ppb ppm ppp ppr pps prb prm prp prr prs ps- psb psm psp psr pss rbb rbm rbp rbr rbs rmb rmm rmp rmr rms rpb rpm rpp rpr rps rrb rrm rrp rrr rrs rsb rsm rsp rsr rss sbb sbm sbp sbr sbs smb smm smp smr sms spb spm spp spr sps sr- srb srm srp srr srs ss- ssb ssm ssp ssr sss