graph([a, b, c, d, e, f, g, h], [e(a, b, 5), e(a, d, 3), e(b, c, 2), e(b, e, 4), e(c, e, 6), e(d, e, 7), e(d, f, 4), e(d, g, 3), e(e, h, 5), e(f, g, 4), e(g, h, 1)]).