O: (0, 0, 0)
p: (2, -2, 2)
u: (-0.5, 1, 0.5)
g = Line((x(p), y(p), z(p)), Vector[(x(u), y(u), z(u))])
D_{0}: g(0)
D_{1}: g(1)
D_{2}: g(2)
D_{3}: g(3)
D_{-1}: g(-1)
D_{-2}: g(-2)
D_{4}: g(4)
D_{5}: g(5)
D_{6}: g(6)