unique array of arrays Perl

Hi all!
I have an array of arrays that i want to make unique. That is, I have:
@AoA=(["1","15"], ["2","5"], ["3","4"], ["3","5"], ["3","8"], ["3","5"], ["4","6"], ["4","5"])
and I want to remove array element ["3","5"] which is seen twice if you notice.
Is that possible? I am confused with this!