// Start from the lexicographically first permutation (=sorted)
std::sort(recipe_copy.begin(), recipe_copy.end());
//while(std::prev_permutation(recipe_copy.begin(), recipe_copy.end())){}
// Start from the lexicographically first permutation (=sorted)
std::sort(recipe_copy.begin(), recipe_copy.end());
//while(std::prev_permutation(recipe_copy.begin(), recipe_copy.end())){}