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my @nums = qw(2 1 3 5 4 5 4 3 2 1);     # order is not important

...
    }
}
## TODO: do something with @unique

my @nums = qw(2 1 3 5 4 5 4 3 2 1);    # order is not important
my %seen = map { $_ => 1 } @nums; # build a hash; keys will be unique!
@nums = sort keys %seen;       # replace old list with new sorted list
## TODO: do something with @nums

my @nums = qw(2 1 3 5 4 5 4 3 2 1);

...
    $previous = $current;     # 'current' becomes 'previous'
}
## TODO: do something with @unique