(Mosaic elements) can be abstract.Logical formLearned from2 sentences. A notion of restraint can be an abstract concept.Logical formLearned from2 sentences. A person may aim at an abstract class.Logical formLearned from2 sentences. A length of a name may be limited by a representation of an abstract (syntax tree).Logical formLearned from2 sentences. A clash can be abstract.Logical formLearned from2 sentences. Contributors can be abstract.Logical formLearned from2 sentences. A (project creation) can be abstract.Logical formLearned from2 sentences. A (software system) may use abstract models.Logical formLearned from2 sentences. A (development toolkit) can be abstract.Logical formLearned from2 sentences. A viewer can be abstract.Logical formLearned from2 sentences. Operations can be applicable to abstract models.Logical formLearned from2 sentences. A musing can be abstract.Logical formLearned from2 sentences. A letter can be abstract.Logical formLearned from2 sentences. (Camera paintings) can be abstract.Logical formLearned from2 sentences. Abstract concepts may be studied in isolation.Logical formLearned from2 sentences.