Task: Question Decomposition
Input (English): question: How many years passed from the start of the Portuguese revolution through the signing of the Treaty of Lisbon?
Output (English): #1 return the  start of   the   Portuguese revolution 
#2 return the  signing of   the   Treaty of Lisbon 
#3 return year of   #1 
#4 return year of   #2 
#5 return the  difference of   #4 and  #3