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Lived briefly in a NYC flat. One of the p-traps did not in fact function as intended. The details are unpleasant, so I'll leave them out.

Most likely an S trap then. They are no allowed due to the probability of self siphoning. Not to say an S wouldn't, but it's improbable.

It was a p-trap with a non-obvious hole the size of a nickel. Became obvious the first time I used a plunger. :-P