A source can be mandatory.Logical formLearned from21 sentences. (Retention periods) can be mandatory.Logical formLearned from21 sentences. (Cost increases) can be mandatory.Logical formLearned from21 sentences. (Emission limits) can be mandatory.Logical formLearned from21 sentences. A retention can be mandatory.Logical formLearned from21 sentences. Tournaments can be mandatory.Logical formLearned from21 sentences. A (water conservation) can be mandatory.Logical formLearned from21 sentences. (Id cards) can be mandatory.Logical formLearned from21 sentences. Punishments can be mandatory.Logical formLearned from21 sentences. Mandatory sentences may lead to prisoners.Logical formLearned from21 sentences. A (testing program) can be mandatory.Logical formLearned from21 sentences. Federal (sentencing guidelines) can be mandatory.Logical formLearned from21 sentences. Approval can be mandatory.Logical formLearned from21 sentences. Deadlines can be mandatory.Logical formLearned from21 sentences. A change can be mandatory.Logical formLearned from21 sentences.