c-- ccc ccd cce cck ccl cdc cdd cde cdk cdl ce- cec ced cee cek cel ckc ckd cl- clc cld cle clk cll dcc dcd dce dck dcl ddc ddd dde ddk ddl de- dec ded dee dek del dkc dke dkk dkl dl- dlc dld dle dlk dll ec- ecc ecd ece eck ecl ed- edc edd ede edk edl eec eed eee eek eel ekc ekd eke ekl elc eld ele elk ell kcc kcd kce kck kcl kdc kde kdk kdl ke- kec ked kee kek kel kkc kke kkk kkl kl- klc kld lcc lcd lce lck lcl ldc ldd lde ldk ldl lec led lee lek lel lkl llc lld lle llk lll