When I take the three words "boy", "meets" and "girl", the sentence "boy meets girl" is correct, but "meets girl boy" is not.
Could you think of three distinct words for which both expressions are correct and make sense?
Note to the downvoters: sorry if this question bothers you. This is my first one of the site. I first posted it on english.stack-exchange, but someone said it would be a better fit here. I agree that there is certainly many correct answers. I just would like one to illustrate a basic programming exercise (i.e., "rotating" the value of 3 variables).