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  1. or download this
    A     (base)
|
B      inherits
|
C      inherits
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             A
         |
  +---+--+---+---+
  B   C      D   E     <---------- Factory picks b,c,d or e
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    A     (base)
|
...
|      |
C      |-- Factory can handle the chain (only B and C shown)
      -+