If a red house is made of red bricks and a yellow house is made of Riddle

If a red house is made of red bricks and a yellow house is made of Riddle

If a red house is made of red bricks and a yellow house is made of Riddle

Solve me this:

If a red house is made of red bricks and a yellow house is made of

If a red house is made of red bricks, and a yellow house is made of yellow bricks, what is a greenhouse made of?

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ANSWER

All greenhouses are made of glass.