bbb bbi bbm bbo bbx bi- bib bii bim bio bix bmb bmi bmm bmo bmx bob boi bom boo box bxb bxi bxm bxo bxx ibb ibi ibm ibo ibx iib iii iim iio iix im- imb imi imm imo imx io- iob ioi iom ioo ixi m-o mbb mbi mbm mbo mbx mi- mib mii mim mio mix mmb mmi mmm mmo mmx mob moi mom moo mox mxi o-i ob- obb obi obm obo obx oib oii oim oio om- omb omi omm omo omx oo- oob ooi oom ooo oox ox- oxb oxi oxo oxx xbx xii xio xix xmi xmm xmo xmx xoi xom xoo xox xxi xxo xxx