context: There are two people running around a track in lane three and the one wearing a blue shirt with a green thing over the eyes is just barely ahead of the guy wearing an orange shirt and sunglasses.
hypothesis: It is certain that two people are racing on foot.
valid_hypothesis: It is certain that two people are racing on foot.
invalid_hypothesis: It is impossible that two people are racing on foot.
hypothesis_assertion: Two people are racing on foot.