Green Glass Door Riddle

There is a green glass door in the middle of Minnesota. Only certain things can go through the door. Here is a list of thing that can and cannot go through the door: Can: a riddle Cant: an answer Can: root beer Cant: soda Can: grass Cant: field Can: tree Cant: bark Can: pool Cant: water Can: roof Cant: ceiling What do all of the things that can go through the door have in common?

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