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(subclass NonlinearEquation Equation) engineering.kif 164-164 非线性方程方程subclass
(subclass BesselsEquation NonlinearEquation) engineering.kif 195-195 贝塞尔斯方程非线性方程subclass
(subclass VanderpolsEquation NonlinearEquation) engineering.kif 200-200 范德波尔斯方程非线性方程subclass


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