A window-washer , dangling from a cord and carrying a white bucket , works on the windows of a red brick building which is labeled with the word `` BUILDING '' on a carved lintel .
There is a very good chance that a window washer is cleaning a building .
There is a very good chance that a window washer is cleaning a building .
It is probably not the case that a window washer is cleaning a building .
A window washer is cleaning a building .