Who are all the opponents of Slovakia?
{'header': ['Edition', 'Round', 'Date', 'Partnering', 'Against', 'Surface', 'Opponents', 'W/L', 'Result'], 'page_title': 'Gastão Elias', 'section_title': 'Doubles (8)', 'caption': 'Doubles (8)', 'rows': [['2007 Davis Cup Europe/Africa Group I', '1R', '9–11 February 2007', 'Frederico Gil', 'Georgia', 'Carpet', 'Lado Chikladze Irakli Labadze', 'Loss', '6–7 (6–7) , 7–6 (9–7) , 6–7 (4–7) , 7–5, 3–6'], ['2007 Davis Cup Europe/Africa Group I', 'GI PO', '21–23 September 2007', 'Frederico Gil', 'Netherlands', 'Hard', 'Jesse Huta Galung Peter Wessels', 'Loss', '2–6, 7–6 (7–5) , 6–7 (5–7) , 3–6'], ['2008 Davis Cup Europe/Africa Group II', '1R', '11–13 April 2008', 'Leonardo Tavares', 'Tunisia', 'Clay', 'Walid Jallali Malek Jaziri', 'Win', '6–3, 6–3, 6–3'], ['2008 Davis Cup Europe/Africa Group II', 'SF', '19–21 September 2008', 'Leonardo Tavares', 'Ukraine', 'Hard', 'Sergei Bubka Sergiy Stakhovsky', 'Loss', '3–6, 2–6, 4–6'], ['2012 Davis Cup Europe/Africa Group I', '2R', '6–8 April 2012', 'João Sousa', 'Israel', 'Clay', 'Andy Ram Jonathan Erlich', 'Loss', '4–6, 4–6, 3–6'], ['2012 Davis Cup Europe/Africa Group I', 'GI PO', '14–16 September 2012', 'João Sousa', 'Slovakia', 'Hard', 'Michal Mertiňák Filip Polášek', 'Loss', '5–7, 6–4, 6–7 (5–7) , 3–6'], ['2013 Davis Cup Europe/Africa Group II', '2R', '5–7 April 2013', 'Rui Machado', 'Lithuania', 'Clay', 'Lukas Mugevicius Mantas Bugailiskis', 'Win', '6-3, 6-0, 6-2']]}