I want to know the answer to the following question:
How many clubs have won the fa cup as part of a league cup double?
All the background I'm provided with is that "Seven clubs have won the FA Cup as part of a League and Cup double, namely Preston North End (1889), Aston Villa (1897), Tottenham Hotspur (1961), Arsenal (1971, 1998, 2002), Liverpool (1986), Manchester United (1994, 1996, 1999) and Chelsea (2010).". Is that enough to answer the question?
Answer: yes