Question: Where does the grand union canal start and end?
Answer: starts in London
ends in Birmingham
Disambiguated annotations:
qaPairs: question: Where does the main part of the Grand Union Canal start and end?
answer: Starts in London, ends in Birmingham
question: Where are the start and end points of the arms of the grand union canal?
answer: Leicester,  Slough, Aylesbury, Wendover, Northampton