context: A man in a suit and tie and a woman with luggage join others in waiting in the London Underground.
hypothesis: There is a better than even chance that a couple are travelling to see friends in London.
valid_hypothesis: There is a better than even chance that a couple are travelling to see friends in London.
invalid_hypothesis: It is improbable that a couple are travelling to see friends in London.
hypothesis_assertion: A couple are travelling to see friends in London.