public void METHOD_1 ( TYPE_1 item ) { if ( ! ( VAR_1 . contains ( item ) ) ) { VAR_1 . add ( item ) ; } } 

public void METHOD_1 ( TYPE_1 item ) { if ( ! ( VAR_1 . contains ( item ) ) ) { VAR_1 . add ( item ) ; } else { VAR_1 . remove ( item ) ; VAR_1 . add ( item ) ; } } 
