Green Glass Door

Riddle: We let apples in, but no bananas. We let pillows in, but no blankets. We let books in, but no libraries. We let school in, but no work. We let parrots in, but no birds. What is the rule of the Green Glass Door?

Answer: Double letters.

Source: https://www.riddles.com/5846

We let apples in, but no bananas. We let pillows in, but no blankets. We let books in, but no libraries. We let school in, but no work. We let parrots in, but no birds. What is the rule of the Green Glass Door? — Green Glass Door by Garvey520 v1.

Riddle: We let apples in, but no bananas. We let pillows in, but no blankets. We let books in, but no libraries. We let school in, but no work. We let parrots in, but no birds. What is the rule of the Green Glass Door? Answer: Double letters. — by Garvey520 v2.