The robot vacuum is really neat!
The robot vacuum sucks up bits.
If a red light flashes on the vacuum it means that we have to charge its batteries at its home.
The lighthouse blocks the robot vacuum from going anywhere else.
If the green light flashes on the lighthouse that means that the battery is running out.
Under the robot vacuum there is a little spinner that picks up the bits.
If the vacuum misses its home it tries again!
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