-ic c-- ccc ccd cce cci ccs ccx cdc cdd cde cdi cds cdx ce- cec ced cee cei ces cex ci- cic cid cie cii cis cix csc csd cse csi css csx cxc cxi cxs cxx dcc dcd dce dci dcs dcx ddc ddd dde ddi dds ddx de- dec ded dee dei des dex di- dic did die dii dis dix dsc dsd dse dsi dss dsx dxc dxd dxi dxs dxx ec- ecc ecd ece eci ecs ecx ed- edc edd ede edi eds edx eec eed eee ees eex eic eid eie eii eis eix es- esc esd ese esi ess esx ex- exc exd exe exi exs exx i-d icc icd ice ici ics idc idd ide idi ids idx ie- iec ied iee iei ies iex iic iid iie iii iis iix is- isc isd ise isi iss ixc ixe ixi scc scd sce sci scs scx sdc sdd sde sdi sds se- sec sed see sei ses sex sic sid sie sii sis six ss- ssc ssd sse ssi sss ssx sxc sxi sxs xcd xci xcx xdc xde xdi xds xed xee xes xex xic xie xii xis xix xsc xsi xss xxi xxx