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  1. or download this
    use strict;
use warnings;
...
  FLAGS = (PADBUSY,PADMY,IOK,pIOK)
  IV = 5
calling foo(3): 3 * 4 = 18
  2. or download this
    use strict;
use warnings;
...
calling foo():  1 * 2 = 2
calling bar(5): 3 * 5 = 15
calling foo(3): 3 * 4 = 12
  3. or download this
    use strict;
use warnings;
...
calling foo():  1 * 2 = 2
calling bar(5): 3 * 5 = 15
calling foo(3): 3 * 4 = 12