u = Vector((0, 0, 0), (2, 3, 2))
A = Point(zAxis)
B = Point(yAxis)
C = Point(yAxis)
D = Point(xAxis)
E = Point(xAxis)
F = Point(yAxis)
a = Plane(E, D, F)
b = Plane(B, C, A)
c = Plane(D, E, A)
v = Vector((0, 0, 0), (2, 3, 0))
w = Vector((0, 0, 0), (0, 3, 2))
z = Vector((0, 0, 0), (2, 0, 2))