code: public final static List<ConnectionNotation> getAllEdgeConnections(List<ConnectionNotation> connections) {
      List<ConnectionNotation> listEdgeConnection = new ArrayList<ConnectionNotation>();
      for (ConnectionNotation connection : connections) {
        if (!(connection.getrGroupSource().equals("pair"))) {
          listEdgeConnection.add(connection);
        }
      }
      return listEdgeConnection;
    }
docs: method to get all edge connections of a given List of ConnectionNotation
  
  @param connections List of ConnectionNotation objects
  @return all edge connections