x1 = cLm x2 = cLc x3 = cLn x4 = cTm x5 = cTc x6 = cTn x7 = cXm x8 = cXc x9 = cXn x10 = cYm x11 = cYc x12 = cYn x13 = cPn x14 = cAm x15 = cAc x16 = cAn