Trafalgar Square Christmas tree
... that since 1947, the city of Oslo has donated the Trafalgar Square Christmas tree to the city of London, in gratitude for its support of Norway in WWII?
... that since 1947,  the city of <a href="./Oslo" id="mwFsQ" rel="mw:WikiLink" title="Oslo">Oslo</a> has donated the <b id="mwFsU"><a href="./Trafalgar_Square_Christmas_tree" id="mwFsY" rel="mw:WikiLink" title="Trafalgar Square Christmas tree">Trafalgar Square Christmas tree</a></b> to the city of <a href="./London" id="mwFsc" rel="mw:WikiLink" title="London">London</a>,  in gratitude for its support of <a href="./Norway" id="mwFsg" rel="mw:WikiLink" title="Norway">Norway</a> in <a class="mw-redirect" href="./WWII" id="mwFsk" rel="mw:WikiLink" title="WWII">WWII</a>?