Task: Question Generation
Input (English): #1 return the  1537 inheritance treaty 
#2 return Frederick William lay claim to the  Silesian principalities 
#3 return year of #1 
#4 return year of #2 
#5 return the  difference of #4 and  #3
Output (English): How many years after the 1537 inheritance treaty did Frederick William lay claim to the Silesian principalities?