$VAR1 = [[1,[1]]];                       :   1
$VAR1 = [[1,[1]],[1,[2]]];               :   2
$VAR1 = [[1,[1]],[2,[2,1]]];             :   2, 1
$VAR1 = [[1,[1]],[2,[2,1]],[2,[2,2]]];   :   2, 2

x $VAR1 = [[1,[1]],[2,[2,1]]];   ->   2, 2, 1
x $VAR1 = [[1,[1]],[2,[2,1]]];   ->   2, 2, 2
x $VAR1 = [[1,[1]]];             ->   2, 1, 1
x $VAR1 = [[1,[1]]];             ->   2, 1, 2

$VAR1 = [[2,[1,1]]];             :   1, 1
$VAR1 = [[2,[1,1]],[2,[1,2]]];   :   1, 2

x $VAR1 = [[2,[1,1]]];   ->   1, 2, 1
x $VAR1 = [[2,[1,1]]];   ->   1, 2, 2
x $VAR1 = [];            ->   1, 1, 1
x $VAR1 = [];            ->   1, 1, 2