A system can be multilevel.Logical formLearned from75 sentences. An approach can be multilevel.Logical formLearned from66 sentences. Systems can be multilevel.Logical formLearned from51 sentences. Classes can be multilevel.Logical formLearned from41 sentences. Marketers can be multilevel.Logical formLearned from37 sentences. Methods can be multilevel.Logical formLearned from37 sentences. A structure can be multilevel.Logical formLearned from33 sentences. A (parking garage) can be multilevel.Logical formLearned from30 sentences. A hierarchy can be multilevel.Logical formLearned from25 sentences. A device can be multilevel.Logical formLearned from24 sentences. Data can be multilevel.Logical formLearned from24 sentences. Techniques can be multilevel.Logical formLearned from23 sentences. A space can be multilevel.Logical formLearned from23 sentences. A marketer can be multilevel.Logical formLearned from23 sentences. A set can be multilevel.Logical formLearned from17 sentences.