ok, simmer down
I'll be sure to check that out - like I said, I'm no expert on nuances of the code like that one.
I agree - venturi effect as mentioned above is not likely to happen - esp. with the vent added to prevent vacuum pulling water out of left trap.
Update - checked code quick, and it does appear that you are right, however 82.31(11)(b) also states that the vent shall be located downstream from BOTH fixtures. So, none of the above illustrations are legal in WI. But, it does appear that you can use the san-tee on it's side to connect the downstream lav to the horizontal branch.