A (value system) can be abstract.Logical formLearned from5 sentences. A (review committee) can be abstract.Logical formLearned from5 sentences. An abstract painting can be nice.Logical formLearned from5 sentences. Compositions can be abstract.Logical formLearned from5 sentences. A theme can be abstract.Logical formLearned from5 sentences. Programs can be abstract.Logical formLearned from5 sentences. A challenge can be abstract.Logical formLearned from5 sentences. Sirens can be abstract.Logical formLearned from5 sentences. A system can be abstract.Logical formLearned from5 sentences. Doodles can be abstract.Logical formLearned from5 sentences. Philosophy can be abstract.Logical formLearned from5 sentences. A paper can be abstract.Logical formLearned from5 sentences. (Bronze figures) can be abstract.Logical formLearned from5 sentences. Thoughts can be abstract.Logical formLearned from5 sentences. A conflict can be abstract.Logical formLearned from5 sentences.