What is the coproduct of structures?

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Suppose S is a family of L-structures where L is some collection of constant symbols, relation symbols, and function symbols. Does the coproduct of elements of S exist?

If not, how does one prove it?

If yes, how is the coproduct defined? Are the maps from elements of S to the coproduct all monic?

If you are aware of references related to this question, I would be happy to know them.

Thanks in advance for your comments.
 
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I was wondering if the pdf I'm attaching answers my question...
 

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