use Data::Dumper;
my @AoA = (['a','b','c'],
           ['a','b','c'],
           ['a','b','d'],
           ['a','b','d']);

my @uAoA = uniq(@AoA);
print Dumper \@uAoA;

sub uniq () {
    my %h;
    map { $h{join($;, @$_)}++ == 0 ? $_ : () } @_;
}