code: @Override
      public boolean compare(Object object) {
          if (object instanceof IBond) {
              Bond bond = (Bond) object;
              for (IAtom atom : atoms) {
                  if (!bond.contains(atom)) {
                      return false;
                  }
              }
  
              // not important ??!!
              //if (order==bond.order)
              //  return false;
  
              return true;
          }
          return false;
      }
docs: Compares a bond with this bond.
  
  @param object Object of type Bond
  @return true if the bond is equal to this bond