An issue may sound abstract.Logical formLearned from2 sentences. A medical definition can be abstract.Logical formLearned from2 sentences. Walls can be abstract.Logical formLearned from2 sentences. Works can be abstract paintings.Logical formLearned from2 sentences. Spots can be abstract.Logical formLearned from2 sentences. A theory may be considered abstract.Logical formLearned from2 sentences. A role can be in a development of abstract expressionism.Logical formLearned from2 sentences. A movement may be knowned as abstract expressionism.Logical formLearned from2 sentences. Figurations can be abstract.Logical formLearned from2 sentences. An own work can be abstract.Logical formLearned from2 sentences. Groupings can be abstract.Logical formLearned from2 sentences. A person may create abstract paintings.Logical formLearned from2 sentences. Persons may implement an abstract (base class).Logical formLearned from2 sentences. An abstract class can be for objects.Logical formLearned from2 sentences. A (stream class) can be abstract.Logical formLearned from2 sentences.