For each of the following, find all minimum sum of products expressions. (if there is more than one solution, the number of solutions is given in parentheses.) Label the solutions as f₁, f₂.

f(w, x, y, z) = m(0, 2, 4, 5, 10, 12, 15) + d(8, 14) (Remember to show both of the 2 solutions)