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  1. or download this
    my ($temp) = [121, 122, 123, 124, 125, etc...]
  2. or download this
    foreach $id (@$temp) {
# do things with $id
}
  3. or download this
    @hash{@$temp}=@$t;
foreach $id (keys %hash) {
# do things with $id
}
  4. or download this
    if ($hash{120}) {
# id 120 exists
}