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21 " If you cannot correctly identify the abstraction there may not be one, and if no common abstraction exists then inheritance is not the solution to your design problem. "
― Sandi Metz , Practical Object Oriented Design in Ruby
22 " Changing requirements are the programming equivalent of friction "
23 " Demeter became a “law” because a human being decided so; don’t be fooled by its grandiose name. "