Step by step 7 steps
  1. Step 1

    red are cones

    O1O2O3O4O5O6O7D1D2D3D4
  2. Step 2
    O1O2O3O4O5O6O7D1D2D3D4
  3. Step 3
    O1O2O3O4O5O6O7D1D2D3D4
  4. Step 4
    O1O2O3O4O5O6O7D1D2D3D4
  5. Step 5
    O1O2O3O4O5O6O7D1D2D3D4
  6. Step 6
    O1O2O3O4O5O6O7D1D2D3D4
  7. Step 7

    so on...

    O1O2O3O4O5O6O7D1D2D3D4