four times each during 2009?
... that Beyoncé and Lady Gaga were the only artists to top the U.S. Billboard Hot Dance Club Songs chart four times each during 2009?
... that <a class="mw-redirect" href="./Beyoncé_Knowles" id="mwERE" rel="mw:WikiLink" title="Beyoncé Knowles">Beyoncé</a> and <a href="./Lady_Gaga" id="mwERI" rel="mw:WikiLink" title="Lady Gaga">Lady Gaga</a> were the only artists to top the U.S. <i id="mwERM"><a href="./Billboard_(magazine)" id="mwERQ" rel="mw:WikiLink" title="Billboard (magazine)">Billboard</a></i> <a class="mw-redirect" href="./Hot_Dance_Club_Songs" id="mwERU" rel="mw:WikiLink" title="Hot Dance Club Songs">Hot Dance Club Songs</a> chart <b id="mwERY"><a class="mw-redirect" href="./List_of_number-one_dance_singles_of_2009_(U.S.)" id="mwERc" rel="mw:WikiLink" title="List of number-one dance singles of 2009 (U.S.)">four times each during 2009?</a></b>