A roof may fail.Logical formLearned from20 sentences. A person may put a roof.Logical formLearned from20 sentences. Solar cells can be on a roof.Logical formLearned from20 sentences. A roof may pertain-to a plant.Logical formLearned from20 sentences. (Tile roofs) can be heavy.Logical formLearned from20 sentences. A shadow may pertain-to a roof.Logical formLearned from20 sentences. Roofs can be constituted-of-or-filled-with homes.Logical formLearned from20 sentences. Prices can be through a roof.Logical formLearned from20 sentences. A roof can be false.Logical formLearned from20 sentences. A roof can be yellow.Logical formLearned from20 sentences. A roof can be tiered.Logical formLearned from20 sentences. A person may find on a roof.Logical formLearned from20 sentences. Roofs can be reinforced.Logical formLearned from20 sentences. A palestinian flag may fly on a roof of a building.Logical formLearned from20 sentences. Snipers can be on roofs.Logical formLearned from20 sentences.