c-- ccc ccd cce ccl ccx cdc cdd cde cdl cdx ce- cec ced cee cel cex cl- clc cld cle cll clx cxc cxl cxx dcc dcd dce dcl dcx ddc ddd dde ddl ddx de- dec ded dee del dex dl- dlc dld dle dll dlx dxc dxd dxl dxx ec- ecc ecd ece ecl ecx ed- edc edd ede edl edx eec eed eee eel eex elc eld ele ell elx ex- exc exd exe exl exx lcc lcd lce lcl lcx ldc ldd lde ldl lec led lee lel lex llc lld lle lll lxc lxd lxx xcd xcl xcx xdc xde xed xee xel xex xld xxl xxx