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#!/usr/bin/env perl -l

...
my $last = '';
my @unique = map { $last eq $_ ? () : ($last = $_) } sort @initial;
print "Unique:  @unique";

Initial: q w e r t y q w e r t y
Unique:  e q r t w y

#!/usr/bin/env perl -l

...
__DATA__
I am supposed to create a unique array
I am not supposed to use hashes

Unique:  I a am array create hashes not supposed to unique use