MM's short orders question

Question for you or anyone who knows this rule.

Do the current rules for NASDAQ stocks permit a market maker to show a bid in L2 below market and the bid is really a short sale order?

Other participants can not do this but can MM's?

The rest of us have to enter a ss order and it shows up on the ask. Can MM's show there SS orders on the bid in disguise?

Greatly appreciate your insight.
 
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