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  1. or download this
    Parent->ChildX
          ->ChildY->GrandchildYX
                  ->GrandchildYY
    
  2. or download this
    Parent.function1 (function1 defined in Parent)
    ChildX.function1 (function1 imported from Parent)
    ChildX.function2 (function2 defined in ChildX)
    ...
    ChildY.function2 (function2 defined in ChildY)
    GrandchildYX.function1 (function1 imported from ChildY)
    GrandchildYX.function2 (function2 defined in GrandchildYX)
    
  3. or download this
    use Parent qw(function1) # function 1 from Parent
    or
    use ChildX qw(function1 function2) # function1 from Parent, function2 
    +from ChildX 
    ...
    use ChildY qw(function1) # function1 from ChildY 
    or
    use GrandchildYX qw(function1 function2) # function1 from ChildY, func
    +tion2 from GrandchildYX