In this task, you are given a sentence. You must judge whether a single noun or verb has been replaced with another word with the same part of speech. The inversion would result in the sentence sounding unnatural, So unnatural sentences will be considered changed. Label the instances as "Original" or "Changed" based on your judgment.

My tongue flicks out and runs inside her low-cut shirt and bra , reaching until it flicks against her nipple .
Original

The cook tossed the biscuit at John , hitting him in the chest with it .
Original

I knew in my heart that I had to do something to mend their relationship .

Original