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- $\left({{{x}{ }{+}{ }{y}{ }{+}{ }{2}{x}{y}}}\right)$
- $\left({{{x}{ }-{ }{y}{ }{+}{ }{2}{x}{y}}}\right)$
- $\left({{{x}{ }-{ }{y}{ }{+}{ }{x}{y}}}\right)$
- $\left({{{x}{ }-{ }{y}{ }{+}{ }{3}{x}{y}}}\right)$