Let's call De Bruijn n-phrase a sequence $S$ of n words $W_1 W_2 W_3... W_n$ such that any "left-rotation" of its words constitutes a correct and meaningful phrase. The left-rotations of $S$ are:
- $W_1 W_2 W_3... W_n$
- $W_2 W_3... W_n W_1$
- $W_3... W_n W_1 W_2$
- $...$
- $W_n W_1 W_2 W_3...$
An (uninteresting) example of a De Bruijn 2-phrase is "work hard" / "hard work".
I don't know any example of a De Bruijn 3-phrase, but a more restrictive question of minea more restrictive question of mine was answered with "someone I love" / "I love someone" (unfortunately, "love someone I" is not valid).
Challenge: find the longest De Bruijn phrase.
NB. Since I am a non-native English speaker, I would be grateful if you could paraphrase in plain English each left-rotation of your phrase.
