A solar cell can be efficient.Logical formLearned from25 sentences. Solar power can be expensive.Logical formLearned from25 sentences. A theory may pertain-to a solar system.Logical formLearned from25 sentences. Inner planets may pertain-to a solar system.Logical formLearned from24 sentences. A receiver can be solar.Logical formLearned from24 sentences. A calendar can be solar.Logical formLearned from24 sentences. An outer solar system may undergo an exploration.Logical formLearned from24 sentences. An (electricity system) can be solar.Logical formLearned from24 sentences. A solar radiation can be high.Logical formLearned from24 sentences. Uvs can be solar.Logical formLearned from24 sentences. Comets can be in a solar system.Logical formLearned from24 sentences. A ray can be solar.Logical formLearned from24 sentences. A manufacturer can be constituted-of-or-filled-with solar cells.Logical formLearned from24 sentences. A solar cell can be three-dimensional.Logical formLearned from24 sentences. A solar cell can be innovative.Logical formLearned from24 sentences.