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Term 1: Term 2:

(subclass OpenTwoDimensionalFigure TwoDimensionalFigure) Merge.kif 16626-16626 Open two dimensional figure is a subclass of two dimensional figure
(subclass TwoDimensionalAngle OpenTwoDimensionalFigure) Merge.kif 16630-16630 Two dimensional angle is a subclass of open two dimensional figure

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