A man washing windows is suspended outside a building on a seat on a rope with a bucket hanging on the side of the seat .
It is probable that a man washes windows outside the tallest skyscraper in the world .
It is impossible that a man washes windows outside the tallest skyscraper in the world .
It is probable that a man washes windows outside the tallest skyscraper in the world .
A man washes windows outside the tallest skyscraper in the world .