Find all valid partners for each man and each woman if there are three men m1, m2, and m3 and three women w1, w2, w3 with these preference rankings of the men for the women, from highest to lowest: m1: w3, w1, w2; m2: w3, w2, w1; m3: w2, w3, w1; and with these preference rankings of the women for the men, from highest to lowest: w1: m3, m2, m1; w2: m1, m3, m2; w3: m3, m2, m1.