How to get all variations / permutations of 2-3+ word keywords

I am talking about something like this:

I would enter:

"example keyword"

I would get:

"example keyword", "keyword example"

I would enter:

"another keyword example"

I would get something like (all possible variations):

"another keyword example", "another example keyword", "keyword another example", "keyword example another", "example another keyword", "example keyword another" etc (again, all possible combinations)

Is there a tool that does something like that? I could not find it.

Thank you.

 

Actually -- easy -- try Googling 'permutation generator' and you'll find a few.