| smarthouse:VisitorAtTheDoor(Entrance) |
| ∧ smarthouse:Tenant(?tenant) |
| ∧ smarthouse:isLocatedIn(?tenant, ?room) |
| ∧ saref:LightSwitch(?light) |
| ∧ smarthouse:isLocatedIn(?light, ?room) |
| ⇒ smarthouse:TemporaryRedLightColourState(?light) |
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