Task: Question Decomposition
Input (English): question: the cheapest flights between boston and philadelphia which arrive between 3 and 5 o'clock on tuesday 
Output (English): #1 return flights 
#2 return #1 from  boston 
#3 return #2 to philadelphia 
#4 return #3 which  arrive between  3 and  5 o'clock 
#5 return #4 on  tuesday