Task: Question Generation
Input (English): #1 return Fear and  Loathing in  America 
#2 return The Proud Highway 
#3 return letters of #1 
#4 return letters of #2 
#5 return when  was  #3 
#6 return when  was  #4 
#7 return which is the  lowest of #5 ,  #6
Output (English): Which book contains the earliest letters, Fear and Loathing in America or The Proud Highway?