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  1. or download this
    # Line 2
my $cleansource = "$course\\$_";
# or: my $cleansource = $course . "\\" . $_;
...
# Lines 6/7
my $s = "$sourceSize$sourceSizeUnit";
# or: my $s = $sourceSize . $sourceSizeUnit
  2. or download this
    $x = $a; $x += $b; $x += $c; $x += $d;

$x = $a + $b + $c + $d;