1831 Londonderry City by-election
... that the 1831 Londonderry City by-election was the second of three in that constituency within nine months, all of which were won by Robert Ferguson?
... that the <b id="mwcA"><a href="./1831_Londonderry_City_by-election" id="mwcQ" rel="mw:WikiLink" title="1831 Londonderry City by-election">1831 Londonderry City by-election</a></b> was the second of three in that constituency within nine months, all of which were won by <a href="./Sir_Robert_Ferguson,_2nd_Baronet" id="mwcg" rel="mw:WikiLink" title="Sir Robert Ferguson, 2nd Baronet">Robert Ferguson</a>?