Let f and g be two real functions given by
f = {(0, 1), (2, 0), (3, −4), (4, 2), (5, 1)}
g = {(1, 0), (2, 2), (3, −1), (4, 4), (5, 3)}
then the domain of f · g is given by ____
{2, 3, 4, 5}