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- ${6}{x}^{2}{ }{+}{ }{12}{x}{y}{ }{+}{ }{8}{y}^{2}$
- ${9}{x}^{2}{ }{+}{ }{12}{x}{y}{ }{+}{ }{16}{y}^{2}$
- ${9}{x}^{2}{ }{-}{ }{12}{x}{y}{ }{+}{ }{16}{y}^{2}$
- ${3}{x}^{2}{ }{+}{ }{12}{x}{y}{ }{+}{ }{4}{y}^{2}$