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28.03.2015
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12.11.x2 y2 4xy 8x 4y 1 0.

12.12.x2 y2 2xy 2x 2y 7 0.

12.13.2xy 2x 2y 3 0.

12.14.4x2 4y2 2xy 12x 12y 1 0.

12.15.3x2 3y2 4xy 8x 12y 1 0.

12.16.x2 y2 8xy 20x 20y 1 0.

12.17.3x2 3y2 2xy 6x 2y 1 0.

12.18.4xy 4x 4y 1 0.

12.19.3x2 3y2 4xy 6x 4y 7 0.

12.20.4xy 4x 4y 6 0.

12.21.5x2 5y2 2xy 10x 2y 1 0.

12.22.2x2 2y2 4xy 8x 8y 1 0.

12.23.x2 y2 2xy 2x 2y 1 0.

12.24.2x2 2y2 4xy 8x 8y 1 0.

12.25.3x2 3y2 2xy 12x 4y 1 0.

12.26.4xy 8x 8y 1 0.

12.27.2x2 2y2 2xy 6x 6y 6 0.

12.28.x2 y2 4xy 4x 2y 5 0.

12.29.4xy 4x 4y 4 0.

12.30.3x2 3y2 4xy 4x 4y 1 0.

12.31.x2 y2 4xy 4x 2y 1 0.