bbb bbi bbm bbo bi- bib bii bim bio biv bmb bmi bmm bmo bmv bob boi bom boo bov bvb bvi bvm bvo bvv i-v ibb ibi ibm ibo ibv iib iii iim iio im- imb imi imm imo imv io- iob ioi iom ioo iov ivb ivi ivo ivv m-o m-v mbb mbi mbm mbo mbv mi- mib mii mim mio miv mmb mmi mmm mmo mmv mob moi mom moo mov mvb mvi mvm mvo mvv o-i ob- obb obi obm obo obv oib oii oim oio oiv om- omb omi omm omo omv oo- oob ooi oom ooo oov ov- ovb ovi ovo ovv vbi vbm vbo vbv vi- vib vii vim vio viv vm- vmi vmm vmo vob voi vom voo vov vvb vvi vvm vvo vvv