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  1. or download this
    #!perl
use warnings;
...
  }
  alert(4);
}
  2. or download this
      if ($old_color eq "red") {
    if ($_ == 11) {
...
      check_win();
    }
  }
  3. or download this
    for $j (1..$row_count) {
    for $k (1..$col_count) {
...
       #ADJACENT EMPTY SPACES, WHATEVER
    }
}
  4. or download this
    sub double_for {
    /&CODE_REFERENCE = $ARG[0];
...
        }
    }
}