diplomatic relations between Bhutan and Thailand
... that the Bhutan-Thailand Friendship Park was launched in 2009 to celebrate the 20th anniversary of diplomatic relations between Bhutan and Thailand?
... that the Bhutan-Thailand Friendship Park was launched in 2009 to celebrate the 20th anniversary of <b id="mwGVA"><a href="./Bhutan–Thailand_relations" id="mwGVE" rel="mw:WikiLink" title="Bhutan–Thailand relations">diplomatic relations between Bhutan and Thailand</a></b>?