question: What are the country code and first name of the players who won in both tourney WTA Championships and Australian Open?
#1 return players 
#2 return tourneys #1 won 
#3 return #1 where #2 is  WTA Championships 
#4 return #1 where #2 is  Australian Open 
#5 return #1 of  both #3 and  #4 
#6 return country codes of  #5 
#7 return first names of  #5 
#8 return #6 ,  #7