There is a strong military presence in the city and a dusk-till-dawn curfew is often in effect.
On certain nights of the week, the curfew is lifted so that people can run errands.
mnli hypothesis: On certain nights of the week, the curfew is lifted so that people can run errands. premise: There is a strong military presence in the city and a dusk-till-dawn curfew is often in effect.