there is a door that is green only certain things can go in it what is the key to the green door?

please help me with this riddle i am stumped.

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Answers (2)

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THE.GREAT.PAPYRUS.and.sans
I looked it up.
Turns out only double letter words can go through (example: riDDle. rOOf.)
So the key must be a double letter word..?
on March 08
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GillianJane
Go through it certain that u can
on May 02, 2015
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