A representation can be abstract.Logical formLearned from2 sentences. An equity can be abstract.Logical formLearned from2 sentences. Validity can be abstract.Logical formLearned from2 sentences. A contribution can be in making abstract concepts.Logical formLearned from2 sentences. Abstract concepts can be operative for (policy purposes).Logical formLearned from2 sentences. Abstract concepts can be fundamental.Logical formLearned from2 sentences. A (data structure) may call an abstract (syntax tree).Logical formLearned from2 sentences. A text can be on abstract algebra.Logical formLearned from2 sentences. Metadata can be abstract.Logical formLearned from2 sentences. Currents can be abstract.Logical formLearned from2 sentences. A (reasoning skill) can be abstract.Logical formLearned from2 sentences. Origins of (pork tenderloin medallions) can be abstract.Logical formLearned from2 sentences. (Processor models) can be abstract.Logical formLearned from2 sentences. (Color spaces) can be abstract.Logical formLearned from2 sentences. A wall-hanging can be abstract.Logical formLearned from2 sentences.