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Re: Dishwasher
No vent - that's a big problem.
No air gap, either into a disposal, air gap, or into a tailpiece fitting, all of which allows for an atmospheric break between the water being pumped out and the drain gravity draining away.
There is a potential for cross connection.
Accessibility of the trap could be a problem.
There is a minimum/maximum fall distance to the trap, but everything is screwed up, so that cannot even be measured.
Those should serve as good starting points.
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