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Find operation are costly operations: try to avoid them.

Make a public List and assign your buttons to that List and then iterate the List.

   public List<GameObject> allButton; // it will show in your inspector assign (Drag and 
                                      // Drop) all your buttons to this list. 

   public void ShowAllButtons(){

      for(int index=0; index < allButton.Count; index++ ){
         allButton..SetActive(true);
      }

   }