How did Holmes know that a man with a wooden leg had been in the room?
He saw some marks on the window-sill and on the floor (some footprints but some in the shape of small circles). The circles were the marks of a wooden leg.
How did Watson think the wooden-legged man had got into the room?
He said that someone else had got into the room first. He had thrown a rope out of the window and the wooden-legged man had climbed up the rope.
What was strange about the footprints in the thick dust?
They were the prints of bare feet. And they were very small.
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