A system-building can be abstract.Logical formLearned from3 sentences. A (lie algebra) can be abstract.Logical formLearned from3 sentences. A supertype can be abstract.Logical formLearned from3 sentences. A lyric can be abstract.Logical formLearned from3 sentences. Anxiety can be abstract.Logical formLearned from3 sentences. Electronics can be abstract.Logical formLearned from3 sentences. A male may be knowned for abstract paintings.Logical formLearned from3 sentences. Some areas can be constituted-of-or-filled-with abstract mathematics.Logical formLearned from3 sentences. A practice can be abstract.Logical formLearned from3 sentences. An (art world) can be abstract.Logical formLearned from3 sentences. A machine can be an abstract machine.Logical formLearned from3 sentences. Opposites can be abstract.Logical formLearned from3 sentences. Ovals can be abstract.Logical formLearned from3 sentences. Work may pertain-to an abstract painter.Logical formLearned from3 sentences. A nexus can be abstract.Logical formLearned from3 sentences.