-ic bbb bbc bbe bbf bbi bbo bbx bcb bcc bce bcf bci bco bcx be- beb bec bee bef bei beo bex bfb bfc bfe bff bfi bfo bfx bi- bib bic bie bif bii bio bix bob boc boe bof boi boo box bxb bxi bxo bxx c-- cbb cbc cbe cbf cbi cbo cbx ccb ccc cce ccf cci cco ccx ce- ceb cec cee cef cei ceo cex cfb cfc cfe cff cfi cfo cfx ci- cib cic cie cif cii cio cix co- cob coc coe cof coi coo cox cxc cxf cxi cxo cxx ebb ebc ebe ebf ebi ebo ebx ec- ecb ecc ece ecf eci eco ecx eeb eec eee eef eeo eex ef- efb efc efe eff efi efo efx eib eic eie eif eii eio eix eo- eob eoc eoe eof eoi eoo ex- exc exe exi exo exx fbb fbc fbe fbf fbi fbo fbx fcb fcc fce fcf fci fco fcx feb fec fee fef fei feo fex ffc ffe fff ffi ffo ffx fib fic fie fif fii fix fob foc foe fof foi foo fox fxe fxi fxx i-f ibb ibc ibe ibf ibi ibo ibx icb icc ice icf ici ico ie- iec iee ief iei iex ifb ifc ife iff ifi ifo ifx iib iic iie iif iii iio iix io- iob ioc ioe iof ioi ioo ixc ixe ixi o-i ob- obb obc obe obf obi obo obx oc- ocb occ ocf oci oco ocx oeb oec oee oef oei oeo oex of- ofb ofc ofe off ofi ofo ofx oib oic oie oif oii oio oo- oob ooc oof ooi ooo oox ox- oxb oxc oxf oxi oxo oxx xbc xbe xbx xcb xcf xci xcx xee xex xfe xfx xic xie xii xio xix xoc xof xoi xoo xox xxi xxo xxx