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- [[File:UnDirGraphCase2.png|thumb|right|Fig.22 The ball can not pass through the middle node.]] ...100 KB (18,249 words) - 09:45, 30 August 2017
- [[File:UnDirGraphCase2.png|thumb|right|Fig.21b Ball cannot pass through the center node.]] ...162 KB (28,558 words) - 09:45, 30 August 2017