#13=AN_ELEMENT_ARRAY_EXPRESSION(.PLUS_TYPE., '', .C_I.);
#14=AN_ELEMENT_ARRAY_EXPRESSION(.PLUS_TYPE., '', .P_I.);
#15=SYMB_DIVIDE_EXPRESSION(*, #13, #14);
#16=SYMB_SUM_EXPRESSION(.PLUS_TYPE., 'i', 'n', #15, *);