my %x = (one => 1, two => 2, three => 3, four => 4, five => 5, six => 6);
my %y = %x;
print "y List:\n";
print "\t$_ -> $y{$_}\n" for keys %y;
$y{one} = '500';
print "\ny List After:\n";
print "\t$_ -> $y{$_}\n" for keys %y;
print "\nx List After:\n";
print "\t$_ -> $x{$_}\n" for keys %x;