An appeal can be mandatory.Logical formLearned from20 sentences. A (purchase obligation) can be mandatory.Logical formLearned from20 sentences. A (training course) can be mandatory.Logical formLearned from20 sentences. A bargaining can be mandatory.Logical formLearned from20 sentences. An instrument can be mandatory.Logical formLearned from20 sentences. An exemption can be mandatory.Logical formLearned from20 sentences. A word can be mandatory.Logical formLearned from20 sentences. Haccps can be mandatory.Logical formLearned from20 sentences. A benefit can be mandatory.Logical formLearned from20 sentences. Sprinklers can be mandatory.Logical formLearned from20 sentences. (Emission standards) can be mandatory.Logical formLearned from20 sentences. Requirements can be mandatory.Logical formLearned from20 sentences. (Pregnancy tests) can be mandatory.Logical formLearned from20 sentences. A foreign language can be mandatory.Logical formLearned from20 sentences. A language can be mandatory in some schools.Logical formLearned from20 sentences.