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Language/Type: PHP parameter mystery parameters return

The following console program uses parameters and returns to produce three lines of output. What are they?

function mystery($b, $c) {
    return $c + 2 * $b;

$a = 4;
$b = 2;
$c = 5;

$a = mystery($c, $b);
$c = mystery($b, $a);
line 1
line 2
line 3

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