ChainsCombinator 
    Given a primary and a secondary chain, it mutates the primary chain by combining the respective values in the given order
  Primary    Secondary       Result (Updated Primary)
    1                          1
    |                          |
    2            2             2
    |            |             |
    4            3             3
    |            |             |
    .            4             4
    .                          .
    .                          .
                               .
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Author
Ennio Visconti