bbb bbi bbm bbr bbs bi- bib bii bim bir bis bmb bmi bmm bmr bms brb bri brm brr brs bsb bsi bsm bsr bss ibb ibi ibm ibr ibs iib iii iim iir iis im- imb imi imm ims ir- irb iri irm irr irs is- isb isi ism isr iss m-r mbb mbi mbm mbr mbs mi- mib mii mim mir mis mmb mmi mmm mmr mms mrb mri mrm mrr mrs msb msi msm msr mss rbb rbi rbm rbr rbs rib rii rim rir ris rmb rmi rmm rmr rms rrb rri rrm rrr rrs rsb rsi rsm rsr rss sbb sbi sbm sbr sbs sib sii sim sir sis smb smi smm smr sms sr- srb sri srm srr srs ss- ssb ssi ssm ssr sss