A fog can be sudden.Logical formLearned from30 sentences. A fog can be heavy.Logical formLearned from30 sentences. Fog can be in valleys.Logical formLearned from30 sentences. A fog can be red.Logical formLearned from29 sentences. (Fog lights) may pertain-to a person.Logical formLearned from29 sentences. A sea can be constituted-of-or-filled-with fog.Logical formLearned from29 sentences. A person may see a fog.Logical formLearned from29 sentences. Fog may cause delays.Logical formLearned from29 sentences. A (brain fog) may pertain-to a person.Logical formLearned from28 sentences. A fog can be in a head.Logical formLearned from28 sentences. A patch can be constituted-of-or-filled-with fog.Logical formLearned from28 sentences. A fog may be gone.Logical formLearned from28 sentences. A fog can be constituted-of-or-filled-with dust.Logical formLearned from28 sentences. A shroud can be constituted-of-or-filled-with fog.Logical formLearned from28 sentences. Some (transport helicopters) may collide in fog.Logical formLearned from28 sentences.