Arrays of Arrays

How do we preserve the data as three unique arrays? An array can only contain scalars. Luckily we know that a reference is a scalar. Let's create an array of array references!
# we have separate arrays we want to combine
my @austin_toys = qw(perl pizzastone pilobolus);
my @justin_toys = ('hack saw', 'boots', 'grout');
my @reinhard_toys = ('OED', 'oatmeal', 'orange juice');

# we could do this: (an array of array refs)
my @toys = ( \@austin_toys, \@justin_toys, \@reinhard_toys );
print "Reinhard's 1st toy is a $toys[2]->[0]\n";
print "Reinhard's 1st toy is a $toys[2][0]\n";

# or this: (an array ref of array refs)
my $toys = [ \@austin_toys, \@justin_toys, \@reinhard_toys ];
print "Reinhard's 1st toy is a $toys->[2][0]\n";