-ic c-- ccc ccd cce ccf cci ccs cdc cdd cde cdf cdi cds ce- cec ced cee cef cei ces cfc cfd cfe cff cfi cfs ci- cic cid cie cif cii cis csc csd cse csf csi css dcc dcd dce dcf dci dcs ddc ddd dde ddf ddi dds de- dec ded dee def dei des dfc dfd dfe dff dfi dfs di- dic did die dif dii dis dsc dsd dse dsf dsi dss ec- ecc ecd ece ecf eci ecs ed- edc edd ede edf edi eds eec eed eee eef ees ef- efc efd efe eff efi efs eic eid eie eif eii eis es- esc esd ese esf esi ess fcc fcd fce fcf fci fcs fdc fdd fde fdf fdi fds fec fed fee fef fei fes ffc ffd ffe fff ffi ffs fic fid fie fif fii fis fsc fsd fse fsf fsi fss i-d i-f icc icd ice icf ici ics idc idd ide idf idi ids ie- iec ied iee ief iei ies ifc ifd ife iff ifi ifs iic iid iie iif iii iis is- isc isd ise isf isi iss scc scd sce scf sci scs sdc sdd sde sdf sdi sds se- sec sed see sef sei ses sfc sfd sfe sff sfi sfs sic sid sie sif sii sis ss- ssc ssd sse ssf ssi sss