(Security reviews) can be periodic.Logical formLearned from16 sentences. Programs can be periodic.Logical formLearned from16 sentences. Debates can be periodic.Logical formLearned from16 sentences. Recessions can be periodic.Logical formLearned from16 sentences. A notification can be periodic.Logical formLearned from16 sentences. An increase can be periodic.Logical formLearned from16 sentences. Purges can be periodic.Logical formLearned from16 sentences. A (boundary condition) can be periodic.Logical formLearned from16 sentences. (Town hall meetings) can be periodic.Logical formLearned from16 sentences. Periodic table may pertain-to elements.Logical formLearned from16 sentences. A cost can be periodic.Logical formLearned from16 sentences. A backup can be periodic.Logical formLearned from16 sentences. E-newsletters can be periodic.Logical formLearned from16 sentences. Conversations can be periodic.Logical formLearned from16 sentences. (Blood transfusions) can be periodic.Logical formLearned from16 sentences.