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Term 1: Term 2:

(subclass OpenTwoDimensionalFigure TwoDimensionalFigure) Merge.kif 17984-17984 Open two dimensional figure is a subclass of two dimensional figure
(subclass TwoDimensionalAngle OpenTwoDimensionalFigure) Merge.kif 17988-17988 Two dimensional angle is a subclass of open two dimensional figure


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