$VAR1 = {
          'name' => 'I1',
          'inputs' => '-'
        };
$VAR2 = {
          'name' => 'I2',
          'inputs' => '-'
        };
$VAR3 = {
          'outputs' => '-',
          'name' => 'O1'
        };
$VAR4 = {
          'outputs' => '-',
          'name' => 'O2'
        };

After we do an AddConnection("I1","O2")
$VAR1 = {
          'outputs' => [
                         'O2'
                       ],
          'name' => 'I1',
          'inputs' => '-'
        };
$VAR2 = {
          'name' => 'I2',
          'inputs' => '-'
        };
$VAR3 = {
          'outputs' => '-',
          'name' => 'O1'
        };
$VAR4 = {
          'outputs' => '-',
          'name' => 'O2',
          'inputs' => [
                        'I1'
                      ]
        };
we have 2 elements to choose from
we picked 0 : O1
we have 2 elements to choose from
we picked 0 : I1