(Lens systems) can be gravitational.Logical formLearned from15 sentences. A gravitational attraction may pertain-to the sun.Logical formLearned from15 sentences. Focusings can be gravitational.Logical formLearned from15 sentences. A gravitational attraction may pertain-to the moon.Logical formLearned from15 sentences. Potential wells can be gravitational.Logical formLearned from15 sentences. Measurements can be gravitational.Logical formLearned from14 sentences. Properties can be gravitational.Logical formLearned from14 sentences. A scattering can be gravitational.Logical formLearned from14 sentences. An event can be gravitational.Logical formLearned from14 sentences. Signals can be gravitational.Logical formLearned from14 sentences. Gravitational waves may be detected.Logical formLearned from14 sentences. A distortion can be gravitational.Logical formLearned from14 sentences. A gravitational pull can be erotic.Logical formLearned from14 sentences. A microlensing can be gravitational.Logical formLearned from14 sentences. Gravitational radiation may undergo an emission.Logical formLearned from14 sentences.