Is there a function for combinatorial oprimization in Mathematica that can use directly the combinatorial object without mapping from the set of permutations into the set of integers or using permutation matrix? If not, what the ways to solve combinatorial oprimization using Mathematica? For example, there is a function like f(x) = 4x₁+3x₂ and constraints like 3x₁+5x₂<=20, x₁+6x₂>=30. The problem is to find maximum of the target funtion on permutation set A₃².
