context: Someone splashing in the water.
hypothesis: It is impossible that the woman splashes as she tries to keep from drowning in the river.
valid_hypothesis: It is impossible that the woman splashes as she tries to keep from drowning in the river.
invalid_hypothesis: It is probably the case that the woman splashes as she tries to keep from drowning in the river.
hypothesis_assertion: The woman splashes as she tries to keep from drowning in the river.