A man wearing a white t-shirt with a green number 3 on the back is on his knees shining black shoes propped up on a box labeled `` SHOESHINE '' .
It is improbable that a man wearing a white t-shirt with a number on the back is shining black shoes propped up on box .
It is certain that a man wearing a white t-shirt with a number on the back is shining black shoes propped up on box .
It is improbable that a man wearing a white t-shirt with a number on the back is shining black shoes propped up on box .
A man wearing a white t-shirt with a number on the back is shining black shoes propped up on box .