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reinvent the wheel

reinvent the wheel: v. To design or implement a tool equivalent to
   an existing one or part of one, with the implication that doing so
   is silly or a waste of time.  This is often a valid criticism.
   On the other hand, automobiles don't use wooden rollers, and some
   kinds of wheel have to be reinvented many times before you get them
   right.  On the third hand, people reinventing the wheel do tend to
   come up with the moral equivalent of a trapezoid with an offset