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  1. or download this
    $a = 3.14159;
{
...
In block, $::a = 3
Outside block, $a = 3.14159
Outside block, $::a = 3.14159
  2. or download this
    $a = 3.14159;
{
...
In block, $::a = 3.14159
Outside block, $a = 3.14159
Outside block, $::a = 3.14159