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my @nums = (17, 10, 20, 33, 30, 40, 10, 33, 40, 15, 16, 17);

my %unordered = map { $_ => undef } @nums;

my @un_nums = join " ", keys %unordered;

print "@un_nums\n";

my @array1 = (1, 2, 3, 4, 5);
my @array2 = ("1 2 3 4 5");

print "@array1\n";
print "@array2\n";