How to handle Drain and Vent Double for Shower and Double Vanity

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Imnotsure

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Apologies for the crude drawing. Curious best ways to handle drain and vent for the following scenario given some limitations.
Shower on the left, double vanity in the center, WC on the right.
Blue is drain lines, Greens are vents, Red is an AAV, light Gray/Blue is a main stack.

The drawing is a starting point to try to understand what to do, not to do, or how to simplify.
Limitations/Considerations:
- Cannot bring any pipes (including shower vent) above vanity, except to its right side in a vary narrow plane.
- I forgot to draw it, but there is a window directly above the double vanity.
- Shower is 6 ft+ from the main stack. Double Vanity is 5' long.
- There is not enough room to drain each lav separately to the right side wall for venting.
- There is not enough room to have shower and vanity drains in separate planes.
- 2” pipe across the board. Except lavs can be 1 1/2.

Some questions:
- Is it OK to have Shower vent go horizontal under the double vanity (below sink floor rim), considering its higher than its own (shower) flood rim?
- Would it make more sense for shower vent to just be another AAV?
- Any other alternatives to draining and venting the double lavs given the limited working area?


Thank you in advance for any advice at all.

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