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my @work = fetch_jobs($starting_condition);
while ( @work ) {
    # ...
}

my @work = fetch_jobs($starting_condition);
while ( @work ) {
...

    # process job
}

my @work = fetch_jobs($starting_condition);
my %seen;
...

    # process job
}

my @work = fetch_jobs($starting_condition);
my %seen;
while ( @work && @work < 1000 ) {
    # ...
}