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//Parameter("")
$a = 1;
//Parameter("")
b = 1;
echo(let() ($a * b));
echo(let($a = 2, b = 3) ($a * b));
echo(let(b = 2, $a = 3) ($a * b));
echo(let($a = 2) ($a * b));
echo(let(b = 3) ($a * b));
echo(let($a = 2, b = 3, $a = 4) ($a * b));
echo(let($a = 2, b = 3, b = 5) ($a * b));
echo(let($a = 2, b = 3, $a = 4, b = 5) ($a * b));
echo(let($a = 2, b = ($a * 3)) ($a * b));
echo(let($a = (2 * b), b = 3) ($a * b));
echo(let($a = (2 * b), b = ($a * 3)) ($a * b));
echo(let(b = ($a * 3), $a = (2 * b)) ($a * b));
echo(let(b = $a, $a = b) [$a, b]);
echo(let(b = (2 * $a), $a = b) [for(i = [1 : b]) ([i, $a])]);
let(42);
let(1, 2, 3, 4);
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