context: Man dog sledding with his child in the icy snow.
hypothesis: It is probably the case that icy snow slowing down a man's dog sled.
valid_hypothesis: It is unlikely that icy snow slowing down a man's dog sled.
invalid_hypothesis: It is probably the case that icy snow slowing down a man's dog sled.
hypothesis_assertion: Icy snow slowing down a man's dog sled.