context: Several children in full riding gear are on horseback in a grassy field carrying polo equipment.
hypothesis: It is likely that the children are at a class to learn how to play polo.
valid_hypothesis: It is likely that the children are at a class to learn how to play polo.
invalid_hypothesis: It is highly unlikely that the children are at a class to learn how to play polo.
hypothesis_assertion: The children are at a class to learn how to play polo.