y = (1*x^4 - 6*x^2 + 8) / (1) on [-2.1, 2.1]
y = (1*x) / (1*x^2 + 1) on [-3, 3]
y = (-1*x^2 + 8) / (1) on [-2, 3]
y = (-2*x) / (1) on [-3, 0]
The arrangement size:
   V = 15,  E = 20,  F = 7
