A refinement can be abstract.Logical formLearned from2 sentences. Problems may involve applications of abstract algebra.Logical formLearned from2 sentences. (Wire sculptures) can be abstract.Logical formLearned from2 sentences. Characters can be abstract.Logical formLearned from2 sentences. A (stock market) can be an abstract concept.Logical formLearned from2 sentences. Abstract concepts may be introduced.Logical formLearned from2 sentences. An optimization can be abstract.Logical formLearned from2 sentences. An (agent class) can be abstract.Logical formLearned from2 sentences. Models may show abstract objects.Logical formLearned from2 sentences. An egovernment can be abstract.Logical formLearned from2 sentences. Abstract paintings can be by a female.Logical formLearned from2 sentences. (Database objects) can be abstract.Logical formLearned from2 sentences. Tangents can be abstract.Logical formLearned from2 sentences. A modern dance can be abstract.Logical formLearned from2 sentences. A hum can be abstract.Logical formLearned from2 sentences.