bbb bbi bbm bbo bbt bi- bib bii bim bio bit bmb bmi bmm bmo bmt bob boi bom boo bot btb bti btm bto btt ibb ibi ibm ibo ibt iib iii iim iio iit im- imb imi imm imo imt io- iob ioi iom ioo iot itb iti itm ito itt m-o mbb mbi mbm mbo mbt mi- mib mii mim mio mit mmb mmi mmm mmo mmt mob moi mom moo mot mtb mti mtm mto mtt o-i ob- obb obi obm obo obt oib oii oim oio oit om- omb omi omm omo omt oo- oob ooi oom ooo oot ot- otb oti otm oto ott tbb tbi tbm tbo tbt tib tii tim tio tit tmb tmi tmm tmo tmt to- tob toi tom too tot ttb tti ttm tto ttt