(Rock videos) may play to 12-year-olds.Logical formLearned from12 sentences. A (rock concert) may do (stage dives).Logical formLearned from12 sentences. A (rock wall) can be dramatic.Logical formLearned from12 sentences. Rocks may swirl in confusion of distance.Logical formLearned from12 sentences. (Rock faces) can be demanding.Logical formLearned from12 sentences. A (rock group) may pertain-to the world.Logical formLearned from12 sentences. Researcher may find a cylinder of rock.Logical formLearned from12 sentences. (Rock ledges) can be sunny.Logical formLearned from12 sentences. (Rock ledges) may be fringed with blueberry.Logical formLearned from12 sentences. A (rock producer) can be legendary.Logical formLearned from12 sentences. Rock can be hotter.Logical formLearned from12 sentences. Rock may extend to depths of some miles.Logical formLearned from12 sentences. Some continents may have keels of rock.Logical formLearned from12 sentences. Keels can be constituted-of-or-filled-with rock.Logical formLearned from12 sentences. Rocks can be puzzling.Logical formLearned from12 sentences.