[R] unique rows

[dax42]

Dear list,

I would like to extract from a matrix all those rows, that are unique.
By unique, I don't mean the unique that is accomplished by the function 
unique(), though...

Consider the following example:
 > h
      [,1] [,2]
[1,]    4    4
[2,]    1    4
[3,]    4    1

Now unique(h) returns exactly the same - because 1 4 and 4 1 is not the 
same for that function.
What I would like to see, though, are only the first two rows (or the 
first and the third, it does not matter).

Does anybody know how to do that?
Cheers, Dax.