'"The cat sat on the mat" is not a story."The cat sat on the dog's mat" is a story.'
'"The cat sat on the mat" is not a story."The cat sat on the dog's mat" is a story.'
'The cat sat on the mat is not a story. The cat sat on the other cat's mat is a story.'
'The cat sat on the mat is not a story. The cat sat on the other cat's mat is a story.'