A person may understand an abstract expression.Logical formLearned from4 sentences. A sponsor can be abstract.Logical formLearned from4 sentences. Conceptual models can be abstract.Logical formLearned from4 sentences. A mess can be abstract.Logical formLearned from4 sentences. (Design principles) can be abstract.Logical formLearned from4 sentences. (Wood sculptures) can be abstract.Logical formLearned from4 sentences. A problem-solving can be abstract.Logical formLearned from4 sentences. Shorts can be abstract.Logical formLearned from4 sentences. Targets can be abstract.Logical formLearned from4 sentences. Patterns can be abstract.Logical formLearned from4 sentences. An injury can be abstract.Logical formLearned from4 sentences. Mysteries can be abstract.Logical formLearned from4 sentences. Certainties can be abstract.Logical formLearned from4 sentences. An imagery can be abstract.Logical formLearned from4 sentences. Abstract expressionism may undergo a movement.Logical formLearned from4 sentences.