-ic c-- ccc ccd cce cci ccx cdc cdd cde cdi cdx ce- cec ced cee cei cex ci- cic cid cie cii cix cxc cxi cxx dcc dcd dce dci dcx ddc ddd dde ddi ddx de- dec ded dee dei dex di- dic did die dii dix dxc dxd dxi dxx ec- ecc ecd ece eci ecx ed- edc edd ede edi edx eec eed eee eex eic eid eie eii eix ex- exc exd exe exi exx i-d icc icd ice ici idc idd ide idi idx ie- iec ied iee iei iex iic iid iie iii iix ixc ixe ixi xcd xci xcx xdc xde xdi xed xee xex xic xie xii xix xxi xxx