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1
The man unlocks a door and goes in.
The Complete Writings of Charles Dudley Warner — Volume 2
2
"Because it unlocks a door that would lead me to-hell," he cried fiercely.
The Conquest of America: A Romance of Disaster and Victory, U.S....
3
"Which key is it that unlocks a door?"
The Voice in the Fog
4
"One o' them unlocks a door."
The Voice in the Fog