"smoke alarms" . "Smoke detector#Photoelectric" . . . "smoke-detector" . "fire detectors" . "Smoke Alarm" . . "smoke detector" . "ionization smoke detector" . . "Smoke detector#Single station smoke detectors" . . . "smoke" . "smoke alarm" . . . "ionizing smoke detector" . "Smoke detector" . . "Fire detectors" . . "Smoke detector#Interconnected smoke detectors" . . . . . . . . "some smoke detector" . "Smoke detector#Ionization" . . . "sensors" . . "detection" . . . "Smoke detectors" . "Smoke alarms" . . "smoke detectors" . "Smoke detector" . . .