bbb bbi bbm bbo bbs bbt bi- bib bii bim bio bis bit bmb bmi bmm bmo bms bmt bob boi bom boo bos bot bsb bsi bsm bso bss bst btb bti btm bto bts btt ibb ibi ibm ibo ibs ibt iib iii iim iio iis iit im- imb imi imm imo ims imt io- iob ioi iom ioo ios iot is- isb isi ism iso iss ist itb iti itm ito its itt m-o mbb mbi mbm mbo mbs mbt mi- mib mii mim mio mis mit mmb mmi mmm mmo mms mmt mob moi mom moo mos mot msb msi msm mso mss mst mtb mti mtm mto mts mtt o-i ob- obb obi obm obo obs obt oib oii oim oio ois oit om- omb omi omm omo oms omt oo- oob ooi oom ooo oos oot os- osb osi osm oso oss ost ot- otb oti otm oto ots ott sbb sbi sbm sbo sbs sbt sib sii sim sio sis sit smb smi smm smo sms smt sob soi som soo sos sot ss- ssb ssi ssm sso sss sst stb sti stm sto sts stt tbb tbi tbm tbo tbs tbt tib tii tim tio tis tit tmb tmi tmm tmo tms tmt to- tob toi tom too tos tot tsb tsi tsm tso tss tst ttb tti ttm tto tts ttt