Given the task definition, example input & output, solve the new input case.
In this task, you will be given two sentences separated by "because". You should decide whether the first sentence can be the result of the second sentence. If you can see a possible cause and effect relationship, answer with "plausible", otherwise answer with "not plausible".
Example: The woman went to the bank because pigs can fly.
Output: not plausible
Clearly, there can't be a causation relationship between someone going to the bank and pigs flying.

New input case for you: the bird couldn't fly because it was too small
Output:
plausible