Is the following structure correct?
Can a can can a can can a can?
Can a tin can put another tin can (which can put a tin can in a tin can), in a tin can
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No, it requires a comma in order to separate the tag question:
Can a can can a can, can a can?
Is a tin able to enclose another tin, [tag question =] is it possible that a tin can do that?
No. "Can a can can a can?" would be grammatically correct, but not the rest. You would need to rephrase it as "Can a can can a can that is canning a can?" if you wanted to keep using the word "can." I wouldn't advise using it unless it's part of a joke or some absurdity that's explained in the text. Even tongue twisters should be able to be worked out by the reader, and while it's possible to work this out, no one will ever be sure of the meaning unless it's explained.