(Listening devices) can be passive.Logical formLearned from6 sentences. A child can be passive.Logical formLearned from6 sentences. (Rfid tags) can be passive.Logical formLearned from6 sentences. Access can be passive.Logical formLearned from6 sentences. Sales can be passive.Logical formLearned from6 sentences. Students may remain passive.Logical formLearned from6 sentences. Parents can be passive.Logical formLearned from6 sentences. A (data transfer process) can be passive.Logical formLearned from6 sentences. A mapping can be passive.Logical formLearned from6 sentences. Holders can be passive.Logical formLearned from6 sentences. An appearance can be passive.Logical formLearned from6 sentences. Antennas can be passive.Logical formLearned from6 sentences. A conception can be passive.Logical formLearned from6 sentences. A stimulation can be passive.Logical formLearned from6 sentences. Capabilities can be passive.Logical formLearned from6 sentences.