-ic bbb bbc bbe bbi bbo bbx bcb bcc bce bci bco bcx be- beb bec bee bei beo bex bi- bib bic bie bii bio bix bob boc boe boi boo box bxb bxi bxo bxx c-- cbb cbc cbe cbi cbo cbx ccb ccc cce cci cco ccx ce- ceb cec cee cei ceo cex ci- cib cic cie cii cio cix co- cob coc coe coi coo cox cxc cxi cxo cxx ebb ebc ebe ebi ebo ebx ec- ecb ecc ece eci eco ecx eeb eec eee eeo eex eib eic eie eii eio eix eo- eob eoc eoe eoi eoo ex- exc exe exi exo exx ibb ibc ibe ibi ibo ibx icb icc ice ici ico ie- iec iee iei iex iib iic iie iii iio iix io- iob ioc ioe ioi ioo ixc ixe ixi o-i ob- obb obc obe obi obo obx oc- ocb occ oci oco ocx oeb oec oee oei oeo oex oib oic oie oii oio oo- oob ooc ooi ooo oox ox- oxb oxc oxi oxo oxx xbc xbe xbx xcb xci xcx xee xex xic xie xii xio xix xoc xoi xoo xox xxi xxo xxx