private boolean ifIsChanged(List<Statement> oldL, List<Statement> newL) {
        if(newL == null && oldL == null)
            return true;
        else if(newL == null)
            return false;
        //System.out.println("CHECK: " + oldL + "\n" + newL);
        for(Statement l: newL)
            if(!oldL.contains(l))
                return true;
        return false;
    }