(Assessment tools) can be valid.Logical formLearned from14 sentences. Grades can be valid.Logical formLearned from14 sentences. (Telephone numbers) can be valid.Logical formLearned from14 sentences. An accusation can be valid.Logical formLearned from14 sentences. An invitation can be valid.Logical formLearned from14 sentences. An (advice coupon) can be valid.Logical formLearned from14 sentences. A norm can be valid.Logical formLearned from14 sentences. Partners can be valid.Logical formLearned from14 sentences. A gift can be valid.Logical formLearned from14 sentences. Queries can be valid.Logical formLearned from14 sentences. Statutes can be valid.Logical formLearned from14 sentences. A pledge can be valid.Logical formLearned from14 sentences. A moratorium can be valid.Logical formLearned from14 sentences. A price can be valid.Logical formLearned from13 sentences. Stamps can be valid.Logical formLearned from13 sentences.