I am reading Accelerated C++. I don't understand Exercise 5-1:
Design and implement a program to produce a permuted index from the following input. A permuted index is one in which each phrase is indexed by every word in the phrase.
The quick brown fox
jumped over the fence
The quick brown fox
jumped over the fence
jumped over the fence
The quick brown fox
jumped over the fence
The quick brown fox
That explanation isn't clear to me. What exactly is a permuted index?