Riddle: Through the Green Glass Doors lies only certain things. What is allowed beyond the green glass doors?

Hint: There are doors but no knobs.
There are roofs but no ceilings.
There is butter but no margarine.
There is killing but no murder.
There is wood but no fire.

So, What is behind the green glass doors?
Answer: Words with two identical letters next to each other.
Green Glass Doors Riddle Meme.
Green Glass Doors Riddle Meme.
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