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