Solve the riddle:
A red house is made out of red bricks.
A yellow house is made of yellow bricks.
A blue house is made out of blue bricks.
What is a green house made out of?

Below you will find a hint and the correct answer to the riddle.
Little hint:
Show Hint
Hint: Gl*s*
Right answer:
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Answer: The greenhouse is made of glass.