context: two people in a rowboat in a river.
hypothesis: It is impossible that two people escape from a sinking ship in a river using a rowboat.
valid_hypothesis: It is impossible that two people escape from a sinking ship in a river using a rowboat.
invalid_hypothesis: It is likely that two people escape from a sinking ship in a river using a rowboat.
hypothesis_assertion: Two people escape from a sinking ship in a river using a rowboat.