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sub format_string {
    my ($str) = @_;
...
    }
    return $new_str;
}

my $wid = WaitWindow('Notepad', 5);

...

MouseMoveAbsPix($x,$y);
SendKeys("{ENTER}");

## Shared the array of select ids
my @id :shared;
...

## Wait for them
$_->join for @threads;

sub _insert {
    my ($node, $cmp, $key, $val) = @_;
...

    return $node;
}

sub _insert {
    my ($node, $cmp, $key, $val) = @_;
...
    }
    return $assign->[NODE];
}

package Tree::Binary::RedBlack;
require Exporter;
...
2. http://www.cs.princeton.edu/~rs/talks/LLRB/RedBlack.pdf
3. http://www.cs.princeton.edu/~rs/talks/LLRB/08Penn.pdf

UPDATE
    table t
...
    )
WHERE
    race_id in (select pkey_id from race where track_id = 37)

table event
   pkey_id    = serial
...
            event_date = e.event_date AND
            event_num  = e.event_num
    )

print solve(
    holes => 33,
...
        [28, 29, 30], [31, 32, 33],
    ],
);

#!/usr/bin/perl
use strict;
...
        }
    };
}

#! /usr/bin/perl
use strict;
...
        return @uniq;
    }
}

package Some::Object;
use strict;
...
    }
    $self->{OPT} = \%user;
}

#!/usr/bin/perl
use strict;
...
    $pm->finish;
    # We are in parent process
}