A (communication device) can be portable.Logical formLearned from13 sentences. A portable (music player) can be popular.Logical formLearned from13 sentences. (Navigation systems) can be portable.Logical formLearned from13 sentences. A respirator can be portable.Logical formLearned from13 sentences. Stairs can be portable.Logical formLearned from13 sentences. Digital-audio players can be portable.Logical formLearned from13 sentences. Babies can be portable.Logical formLearned from13 sentences. Organizers can be portable.Logical formLearned from13 sentences. A theater can be portable.Logical formLearned from13 sentences. Electronic organizers can be portable.Logical formLearned from13 sentences. A person may have a portable computer.Logical formLearned from13 sentences. A playpen can be portable.Logical formLearned from13 sentences. (Play yards) can be portable.Logical formLearned from13 sentences. Use can be in portable computers.Logical formLearned from13 sentences. (Weather stations) can be portable.Logical formLearned from13 sentences.