bbb bbi bbm bbo bbr bbs bi- bib bii bim bio bir bis bmb bmi bmm bmo bmr bms bob boi bom boo bor bos brb bri brm bro brr brs bsb bsi bsm bso bsr bss ibb ibi ibm ibo ibr ibs iib iii iim iio iir iis im- imb imi imm imo ims io- iob ioi iom ioo ior ios ir- irb iri irm iro irr irs is- isb isi ism iso isr iss m-o m-r mbb mbi mbm mbo mbr mbs mi- mib mii mim mio mir mis mmb mmi mmm mmo mmr mms mob moi mom moo mor mos mrb mri mrm mro mrr mrs msb msi msm mso msr mss o-i ob- obb obi obm obo obr obs oib oii oim oio oir ois om- omb omi omm omo omr oms oo- oob ooi oom ooo oor oos or- orb ori orm oro orr ors os- osb osi osm oso osr oss rbb rbi rbm rbo rbr rbs rib rii rim rio rir ris rmb rmi rmm rmo rmr rms rob roi rom roo ror ros rrb rri rrm rrr rrs rsb rsi rsm rso rsr rss sbb sbi sbm sbo sbr sbs sib sii sim sio sir sis smb smi smm smo smr sms sob soi som soo sor sos sr- srb sri srm sro srr srs ss- ssb ssi ssm sso ssr sss