A (tube hose) can be guarded.Logical formLearned from17 sentences. Treasures can be guarded.Logical formLearned from17 sentences. Prisoners can be guarded.Logical formLearned from17 sentences. Frontiers can be guarded.Logical formLearned from17 sentences. A housing can be guarded.Logical formLearned from17 sentences. Locations can be guarded.Logical formLearned from17 sentences. An apartment can be guarded.Logical formLearned from17 sentences. An optimism can be guarded.Logical formLearned from17 sentences. A village can be guarded.Logical formLearned from16 sentences. An (air base) can be guarded.Logical formLearned from16 sentences. A smile can be guarded.Logical formLearned from16 sentences. Places can be guarded.Logical formLearned from16 sentences. An one can be guarded.Logical formLearned from16 sentences. Targets can be guarded.Logical formLearned from16 sentences. A green can be guarded.Logical formLearned from16 sentences.