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".

I came upon a puddle on the sidewalk, so i played in the puddle
plausible

Several witnesses of the crime testified against the suspect, so no charges were filed
not plausible

I clumsily bumped into the stranger, so I started to walk up

not plausible