In this task, you will be given two sentences separated by ", so". You should decide whether the first sentence can be the cause of the second sentence. If you can see a possible causation, answer with "plausible", otherwise answer with "not plausible".

Example Input: I came upon a puddle on the sidewalk, so I went downstairs to check
Example Output: not plausible

Example Input: The surfer caught the wave, so we knew we were on the right track
Example Output: not plausible

Example Input: My foot went numb, so causing me to fall to the floor
Example Output:
plausible