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 pushed the pendulum, so I don't have to worry about that
Example Output: not plausible

Example Input: The man looked at his watch, so I decided to follow him
Example Output: not plausible

Example Input: Several witnesses of the crime testified against the suspect, so they decided to investigate further
Example Output:
plausible