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No one can help me with this? Or is it just a completely stupid question?

Newbie question: When you see on globex the following (bid price/bid size ask price/ask size) in rapid succession: 2850 10 2851 300 2851 20 2852 10 2850 10 2851 30 without ANY fills, would you have to assume that it is a single market maker adjusting? Or else how can multiple...