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Term 1: Term 2:

(subclass TwoDimensionalAngle OpenTwoDimensionalFigure) Merge.kif 17805-17805 二维角度开放二维图subclass
(subclass ObliqueAngle TwoDimensionalAngle) Mid-level-ontology.kif 4844-4844 斜角二维角度subclass
(subclass RightAngle TwoDimensionalAngle) Mid-level-ontology.kif 4855-4855 直角二维角度subclass
(subclass AcuteAngle TwoDimensionalAngle) Mid-level-ontology.kif 4863-4863 锐角二维角度subclass


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