code

$a=2, $b=1
$value=1
$b=$value, returing 1.
$a=2, $b=3
$value=1
$value=3
$b=$value, returing 1.
$a=1, $b=3
$value=1
$a=$value, returing 0.
$a=2, $b=4
$value=1
$value=3
$value=4
$b=$value, returing 1.
$a=3, $b=4
$value=1
$value=3
$a=$value, returing 0.
$a=2, $b=2
$value=1
$value=3
$value=4
$value=2
$a=$value, returing 0.
$a=2, $b=1
$value=1
$b=$value, returing 1.
$a=2, $b=1
$value=1
$b=$value, returing 1.
$a=4, $b=1
$value=1
$b=$value, returing 1.
$a=3, $b=1
$value=1
$b=$value, returing 1.
$a=1, $b=1
$value=1
$a=$value, returing 0.
$a=2, $b=2
$value=1
$value=3
$value=4
$value=2
$a=$value, returing 0.