Saturdays bring throngs of teenagers from the suburbs to shop, watch films, roller skate, munch fast food, and just hang out.
There are no teenagers in the suburbs, so none come to visit on Saturdays.
mnli hypothesis: There are no teenagers in the suburbs, so none come to visit on Saturdays. premise: Saturdays bring throngs of teenagers from the suburbs to shop, watch films, roller skate, munch fast food, and just hang out.