result = (getAttendsSet().equals(((IStudentGroup) arg0).getAttendsSet())) && (getGroupNumber().equals(((IStudentGroup) arg0).getGroupNumber()));
result = getIdInternal().equals(((IStudentGroup) arg0).getIdInternal());
    public boolean equals(Object arg0) {        boolean result = false;        if (arg0 instanceof IStudentGroup) {            result = (getAttendsSet().equals(((IStudentGroup) arg0).getAttendsSet()))                    && (getGroupNumber().equals(((IStudentGroup) arg0).getGroupNumber()));        }        return result;    }