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  1. or download this
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$this && $that   |    If $this is true, and $that is true
...
                 |    If $that evaluates true, return 
                 |    the value of $that.
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  2. or download this
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$this && $that   |    If $this is true, return $that,          
...
$this || $that   |    If $this is true, return $this,
                 |    else return $that.
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