At 11pm, all the houses in town switch on all their lights, opening all the doors and windows, setting the hillside ablaze in light.
Some of the houses do not switch on their lights at 11pm
mnli hypothesis: Some of the houses do not switch on their lights at 11pm premise: At 11pm, all the houses in town switch on all their lights, opening all the doors and windows, setting the hillside ablaze in light.