context: A skateboarder goes down a railing.
hypothesis: It is impossible that a skateboarder finally succeeds in going down a railing after many tries.
valid_hypothesis: It is probably the case that a skateboarder finally succeeds in going down a railing after many tries.
invalid_hypothesis: It is impossible that a skateboarder finally succeeds in going down a railing after many tries.
hypothesis_assertion: A skateboarder finally succeeds in going down a railing after many tries.