my @array1 = (['a', 'b'], ['c', 'd']);

my @ab = qw(a b);
my @cd = qw(c d);
my @array2 = (\@ab, \@cd);

my @array3;
push @array3, \@ab;
push @array3, \@cd;

my @array4;
push @array4, (\@ab, \@cd);