Goal and options: how to fake a window shadow?

OPTIONS:
- cut out shapes in a piece of cardboard.
- use a light bulb and a piece of led strip lighting.
output answer: cut out shapes in a piece of cardboard.

Goal and options: hands

OPTIONS:
- can be used to clean up rocks
- can be used to clean up tree stumps
output answer: can be used to clean up rocks

Goal and options: mold

OPTIONS:
- can be removed by water
- can be removed by vinegar
output answer:
can be removed by vinegar