A background can be troubled.Logical formLearned from5 sentences. A (defense system) can be troubled.Logical formLearned from5 sentences. Persons can be troubled by some shortcoming.Logical formLearned from5 sentences. A battalion can be troubled.Logical formLearned from5 sentences. Troubled waters may be caused by release of nutrients.Logical formLearned from5 sentences. Acquisitions can be troubled.Logical formLearned from5 sentences. An international (space station) can be troubled.Logical formLearned from5 sentences. A (space shuttle) can be troubled.Logical formLearned from5 sentences. Persons may remain troubled.Logical formLearned from5 sentences. Senators can be troubled.Logical formLearned from5 sentences. A yacht can be troubled.Logical formLearned from5 sentences. Stomaches can be troubled.Logical formLearned from5 sentences. Presence can be troubled.Logical formLearned from5 sentences. A view can be troubled.Logical formLearned from5 sentences. A rocket can be troubled.Logical formLearned from5 sentences.