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void lectures::on_del_article_clicked(){	int n=ui->articles->currentRow();	QString del=ui->articles->currentItem()->text();	for (int i=0;i<articles_there.length();i++)	{		if (articles_there[i]==del[0] && articles_there[i+1]==del[1] && articles_there[i+2]==del[2])		{			articles_there.remove(i,del.length()+1);			delete ui->articles->item(n);		}	}}