-ic c-- ccc ccd cce cci cco ccx cdc cdd cde cdi cdo cdx ce- cec ced cee cei ceo cex ci- cic cid cie cii cio cix co- coc cod coe coi coo cox cxc cxi cxo cxx dcc dcd dce dci dco dcx ddc ddd dde ddi ddo ddx de- dec ded dee dei deo dex di- dic did die dii dio dix doc dod doe doi doo dox dxc dxd dxi dxo dxx ec- ecc ecd ece eci eco ecx ed- edc edd ede edi edo edx eec eed eee eeo eex eic eid eie eii eio eix eo- eoc eod eoe eoi eoo ex- exc exd exe exi exo exx i-d icc icd ice ici ico idc idd ide idi ido idx ie- iec ied iee iei iex iic iid iie iii iio iix io- ioc iod ioe ioi ioo ixc ixe ixi o-i oc- occ ocd oci oco ocx odc odd ode odi odo oec oed oee oei oeo oex oic oid oie oii oio oo- ooc ood ooi ooo oox ox- oxc oxi oxo oxx xcd xci xcx xdc xde xdi xed xee xex xic xie xii xio xix xoc xod xoi xoo xox xxi xxo xxx