It is often necessary to list the sample space and/or the outcomes of a set using set notation. For the dice lattice above, the set of all outcomes where the first roll was a 1 can be listed as: {(1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6)}. This set of outcomes is a subset of the set because all of the elements of the subset are also contained in the original set. Give the subset that contains all elements that sum to 9.