A structure can be periodic.Logical formLearned from154 sentences. A drought can be periodic.Logical formLearned from143 sentences. Structures can be periodic.Logical formLearned from140 sentences. Trips can be periodic.Logical formLearned from139 sentences. Checkups can be periodic.Logical formLearned from138 sentences. A cleaning can be periodic.Logical formLearned from137 sentences. (Progress reports) can be periodic.Logical formLearned from133 sentences. Fires can be periodic.Logical formLearned from133 sentences. A screening can be periodic.Logical formLearned from132 sentences. A rate can be periodic.Logical formLearned from129 sentences. Conferences can be periodic.Logical formLearned from126 sentences. An abstinence can be periodic.Logical formLearned from124 sentences. Crackdowns can be periodic.Logical formLearned from124 sentences. Violence can be periodic.Logical formLearned from123 sentences. Events can be periodic.Logical formLearned from121 sentences.