is communication a requirement to collaborate?

Hello,

I am currently looking into communication and collaboration among 
agents. Does anyone have an educated answer about the following question.

 > Is collaboration possible without communication?

By "without communication", I mean: no exchange of any information 
whatsoever - not before collaboration, not during collaboration, not 
through the environment, not through signals and not through direct means.

In case, anyone has a positive answer, it would be helpful if there is 
also a publication about this matter.

I am looking forward to responses.

/Christian

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