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- ${-}{3}{x}^{2}{y}{ }{+}{ }{x}{ }{-}{ }{2}{y}^{2}$
- ${3}{x}^{4}{y}{ }{+}{ }{x}^{3}{ }{-}{ }{2}{x}^{2}{y}^{2}$
- ${-}{12}{x}^{2}{y}{ }{+}{ }{4}{x}{ }{-}{ }{2}{y}^{2}$
- ${3}{x}^{2}{y}{ }{-}{ }{x}{ }{+}{ }{2}{y}^{2}$