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Not all equals Methods are Simple

• Two sets are equal if they have the same elements in some order
  

  public boolean equals(Object o)
  
  {
  
     if (o == this) return true;
  
     if (!(o instanceof Set)) return false;
  
     Collection c = (Collection) o;
  
     if (c.size() != size()) return false;
  
     return containsAll(c);
  
  }
  
  

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