Refer to this example
Question is, whether it is possible to connect two virtual chassis with one LAG instead of two and if yes - would all links be used for transmitting.
That link is a strange example - to answer your question though - yes, it is possible (and I would even say recommended) to have all four interfaces in a single link aggregation.
That way you don't end up with spanning-tree blocking one of the LAGs as per that diagram/example.
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