A lady with sunglasses on her head is wearing a blue top with a black top on top of it and is walking behind a man wearing a pink shirt .
It is certain that a lady in a blue skirt walks behind a man wearing jeans .
It is probably not the case that a lady in a blue skirt walks behind a man wearing jeans .
It is certain that a lady in a blue skirt walks behind a man wearing jeans .
A lady in a blue skirt walks behind a man wearing jeans .