bbb bbi bbm bbo bbs bbx bi- bib bii bim bio bis bix bmb bmi bmm bmo bms bmx bob boi bom boo bos box bsb bsi bsm bso bss bsx bxb bxi bxm bxo bxx ibb ibi ibm ibo ibs ibx iib iii iim iio iis iix im- imb imi imm imo ims imx io- iob ioi iom ioo ios is- isb isi ism iso iss ixi m-o mbb mbi mbm mbo mbs mbx mi- mib mii mim mio mis mix mmb mmi mmm mmo mms mmx mob moi mom moo mos mox msb msi msm mso mss msx mxi mxs o-i ob- obb obi obm obo obs obx oib oii oim oio ois om- omb omi omm omo oms omx oo- oob ooi oom ooo oos oox os- osb osi osm oso oss osx ox- oxb oxi oxo oxx sbb sbi sbm sbo sbs sbx sib sii sim sio sis six smb smi smm smo sms smx sob soi som soo sos sox ss- ssb ssi ssm sso sss ssx sxi sxm sxs xbx xii xio xis xix xmi xmm xmo xms xmx xoi xom xoo xos xox xsb xsi xsm xss xxi xxo xxx