Current advantages.rst embeds the wrong lines from examples/intersecting_pipes.py. With these changes, the lines you would see are
```python
from build123d import *
with BuildPart() as pipes:
box = Box(10, 10, 10, rotation=(10, 20, 30))
with BuildSketch(*box.faces()) as pipe:
Circle(4)
extrude(amount=-5, mode=Mode.SUBTRACT)
with BuildSketch(*box.faces()) as pipe:
Circle(4.5)
Circle(4, mode=Mode.SUBTRACT)
extrude(amount=10)
fillet(pipes.edges(Select.LAST), 0.2)
```