A (section text) can be abstract.Logical formLearned from3 sentences. A router can be abstract.Logical formLearned from3 sentences. A (state definition) can be abstract.Logical formLearned from3 sentences. A syntax of an (object type) may define an abstract (data structure).Logical formLearned from3 sentences. An element can be abstract.Logical formLearned from3 sentences. A term may sound abstract.Logical formLearned from3 sentences. Paintings can be by abstract expressionists.Logical formLearned from3 sentences. Changes can be abstract.Logical formLearned from3 sentences. Action can be abstract.Logical formLearned from3 sentences. Theory can be abstract.Logical formLearned from3 sentences. A (type circle) can be abstract.Logical formLearned from3 sentences. A high-level language can be with abstract (data types).Logical formLearned from3 sentences. Abstract machines can be recursive.Logical formLearned from3 sentences. A term may describe an abstract structure.Logical formLearned from3 sentences. An abstract structure may consist of nodes.Logical formLearned from3 sentences.